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việc sử dụng “response.setContentType (” text / html “)” trong servlet là gì

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Summary of article content: Articles about việc sử dụng “response.setContentType (” text / html “)” trong servlet là gì Các loại nội dung được bao gồm trong phản hồi HTTP vì cùng một byte đối với chuỗi giá trị byte trong nội dung có thể được diễn giải theo nhiều cách. (*). …
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Summary of article content: Articles about javax.servlet.http.HttpServletResponse.setContentType java code examples | Tabnine response.setContentType(“text/plain”); // Set content type of the response so that jQuery knows what it can expect. …
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Summary of article content: Articles about Response trong Servlet – học servlet cơ bản đến nâng cao – Viettuts Thiết lập kiểu nội dung của câu trả lời được gửi đến khách hàng, nếu chưa trả lời. 19, vo setContentType(String type). Thiết lập một header đáp ứng với tên và … …
Most searched keywords: Whether you are looking for Response trong Servlet – học servlet cơ bản đến nâng cao – Viettuts Thiết lập kiểu nội dung của câu trả lời được gửi đến khách hàng, nếu chưa trả lời. 19, vo setContentType(String type). Thiết lập một header đáp ứng với tên và … Khi Web server đáp ứng (response) yêu cầu của HTTP request. Một response thông thường bao gồm trạng thái (status), header, blank line, và document.
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Servlet Tuts

Các phương thức để set HTTP Header response trong servlet

Ví dụ response trong servlet

Response trong Servlet - học servlet cơ bản đến nâng cao - Viettuts — Response trong Servlet – học servlet cơ bản đến nâng cao – Viettuts

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Summary of article content: Articles about java – what is the use of “response.setContentType(“text/html”)” in servlet – Stack Overflow setContentType(“text/html;charset=UTF-8”);. The response’s character encoding is only set from the given content type if this method is called before … …
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Summary of article content: Articles about IXpsOMCoreProperties::SetContentType (xpsobjectmodel.h) – Win32 apps | Microsoft Docs HRESULT SetContentType( [in] LPCWSTR contentType );. Parameters. [in] contentType. The string to be written to the contentType property. …
Most searched keywords: Whether you are looking for IXpsOMCoreProperties::SetContentType (xpsobjectmodel.h) – Win32 apps | Microsoft Docs HRESULT SetContentType( [in] LPCWSTR contentType );. Parameters. [in] contentType. The string to be written to the contentType property. Sets the contentType property.
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Syntax

Parameters

Return value

Remarks

Requirements

javax.servlet.http.HttpServletResponse.setContentType java code examples

setHeader Sets a response header with the given name and value. If the header had already been set, the new va

sendError Sends an error response to the client using the specified status. The server defaults to creating th

sendRedirect Sends a temporary redirect response to the client using the specified redirect location URL. This me

addHeader Adds a response header with the given name and value. This method allows response headers to have mu

addCookie Adds the specified cookie to the response. This method can be called multiple times to set more than

Response trong Servlet

Khi Web server đáp ứng (response) yêu cầu của HTTP request. Một response thông thường bao gồm trạng thái (status), header, blank line, và document.

Dòng trạng thái (status) bao gồm: phiên bản HTTP (trong ví dụ là HTTP / 1.1), mã trạng thái (trong ví dụ là 200) và một thông báo rất ngắn tương ứng với mã trạng thái (trong ví dụ là OK).

Các phương thức sau đây có thể được sử dụng để set HTTP Header response trong chương trình servlet của bạn. Các phương pháp này có sẵn trong đối tượng HttpServletResponse.

Như bạn đã thấy phương thức setContentType() đã từng được sử dụng trong các ví dụ trước. Và nó cũng được sử dụng trong ví dụ này, ngoài ra chúng ta sử dụng phương thức setIntHeader() để set header là Refresh.

Tạo file DisplayHeader.java

package vn.viettuts; import java.io.IOException; import java.io.PrintWriter; import java.util.Calendar; import java.util.GregorianCalendar; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; //Extend HttpServlet class public class Refresh extends HttpServlet { // Method to handle GET method request. public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Set refresh, autoload time as 5 seconds response.setIntHeader(“Refresh”, 5); // Set response content type response.setContentType(“text/html”); // Get current time Calendar calendar = new GregorianCalendar(); String am_pm; int hour = calendar.get(Calendar.HOUR); int minute = calendar.get(Calendar.MINUTE); int second = calendar.get(Calendar.SECOND); if (calendar.get(Calendar.AM_PM) == 0) am_pm = “AM”; else am_pm = “PM”; String CT = hour + “:” + minute + “:” + second + ” ” + am_pm; PrintWriter out = response.getWriter(); String title = “Auto Refresh Header Setting”; String docType = “

“; out.println(docType + “

” + “” + title + “

“+ “

” + “

” + title + “

” + “

Current Time is: ” + CT + “

“); } // Method to handle POST method request. public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }

ServletResponse (Java EE 6 )

javax.servlet

Interface ServletResponse

All Known Subinterfaces: HttpServletResponse

All Known Implementing Classes: HttpServletResponseWrapper, ServletResponseWrapper

public interface ServletResponse

Defines an object to assist a servlet in sending a response to the client. The servlet container creates a ServletResponse object and passes it as an argument to the servlet’s service method.

To send binary data in a MIME body response, use the ServletOutputStream returned by getOutputStream() . To send character data, use the PrintWriter object returned by getWriter() . To mix binary and text data, for example, to create a multipart response, use a ServletOutputStream and manage the character sections manually.

The charset for the MIME body response can be specified explicitly using the setCharacterEncoding(java.lang.String) and setContentType(java.lang.String) methods, or implicitly using the setLocale(java.util.Locale) method. Explicit specifications take precedence over implicit specifications. If no charset is specified, ISO-8859-1 will be used. The setCharacterEncoding , setContentType , or setLocale method must be called before getWriter and before committing the response for the character encoding to be used.

See the Internet RFCs such as RFC 2045 for more information on MIME. Protocols such as SMTP and HTTP define profiles of MIME, and those standards are still evolving.

Author: Various See Also: ServletOutputStream

Method Summary void flushBuffer()

Forces any content in the buffer to be written to the client. int getBufferSize()

Returns the actual buffer size used for the response. java.lang.String getCharacterEncoding()

Returns the name of the character encoding (MIME charset) used for the body sent in this response. java.lang.String getContentType()

Returns the content type used for the MIME body sent in this response. java.util.Locale getLocale()

Returns the locale specified for this response using the setLocale(java.util.Locale) method. ServletOutputStream getOutputStream()

Returns a ServletOutputStream suitable for writing binary data in the response. java.io.PrintWriter getWriter()

Returns a PrintWriter object that can send character text to the client. boolean isCommitted()

Returns a boolean indicating if the response has been committed. void reset()

Clears any data that exists in the buffer as well as the status code and headers. void resetBuffer()

Clears the content of the underlying buffer in the response without clearing headers or status code. void setBufferSize(int size)

Sets the preferred buffer size for the body of the response. void setCharacterEncoding(java.lang.String charset)

Sets the character encoding (MIME charset) of the response being sent to the client, for example, to UTF-8. void setContentLength(int len)

Sets the length of the content body in the response In HTTP servlets, this method sets the HTTP Content-Length header. void setContentType(java.lang.String type)

Sets the content type of the response being sent to the client, if the response has not been committed yet. void setLocale(java.util.Locale loc)

Sets the locale of the response, if the response has not been committed yet.

Method Detail

getCharacterEncoding

java.lang.String getCharacterEncoding()

Returns the name of the character encoding (MIME charset) used for the body sent in this response. The character encoding may have been specified explicitly using the setCharacterEncoding(java.lang.String) or setContentType(java.lang.String) methods, or implicitly using the setLocale(java.util.Locale) method. Explicit specifications take precedence over implicit specifications. Calls made to these methods after getWriter has been called or after the response has been committed have no effect on the character encoding. If no character encoding has been specified, ISO-8859-1 is returned. See RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt) for more information about character encoding and MIME. Returns: a String specifying the name of the character encoding, for example, UTF-8

getContentType

java.lang.String getContentType()

Returns the content type used for the MIME body sent in this response. The content type proper must have been specified using setContentType(java.lang.String) before the response is committed. If no content type has been specified, this method returns null. If a content type has been specified, and a character encoding has been explicitly or implicitly specified as described in getCharacterEncoding() or getWriter() has been called, the charset parameter is included in the string returned. If no character encoding has been specified, the charset parameter is omitted. Returns: a String specifying the content type, for example, text/html; charset=UTF-8 , or null Since: Servlet 2.4

getOutputStream

ServletOutputStream getOutputStream() throws java.io.IOException

Returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data. Calling flush() on the ServletOutputStream commits the response. Either this method or getWriter() may be called to write the body, not both. Returns: a ServletOutputStream for writing binary data Throws: IllegalStateException – if the getWriter method has been called on this response java.io.IOException – if an input or output exception occurred See Also: getWriter()

getWriter

java.io.PrintWriter getWriter() throws java.io.IOException

Returns a PrintWriter object that can send character text to the client. The PrintWriter uses the character encoding returned by getCharacterEncoding() . If the response’s character encoding has not been specified as described in getCharacterEncoding (i.e., the method just returns the default value ISO-8859-1 ), getWriter updates it to ISO-8859-1 . Calling flush() on the PrintWriter commits the response. Either this method or getOutputStream() may be called to write the body, not both. Returns: a PrintWriter object that can return character data to the client Throws: UnsupportedEncodingException – if the character encoding returned by getCharacterEncoding cannot be used IllegalStateException – if the getOutputStream method has already been called for this response object java.io.IOException – if an input or output exception occurred See Also: getOutputStream() , setCharacterEncoding(java.lang.String)

setCharacterEncoding

void setCharacterEncoding(java.lang.String charset)

Sets the character encoding (MIME charset) of the response being sent to the client, for example, to UTF-8. If the character encoding has already been set by setContentType(java.lang.String) or setLocale(java.util.Locale) , this method overrides it. Calling setContentType(java.lang.String) with the String of text/html and calling this method with the String of UTF-8 is equivalent with calling setContentType with the String of text/html; charset=UTF-8 . This method can be called repeatedly to change the character encoding. This method has no effect if it is called after getWriter has been called or after the response has been committed. Containers must communicate the character encoding used for the servlet response’s writer to the client if the protocol provides a way for doing so. In the case of HTTP, the character encoding is communicated as part of the Content-Type header for text media types. Note that the character encoding cannot be communicated via HTTP headers if the servlet does not specify a content type; however, it is still used to encode text written via the servlet response’s writer. Parameters: charset – a String specifying only the character set defined by IANA Character Sets (http://www.iana.org/assignments/character-sets) Since: Servlet 2.4 See Also: #setLocale

setContentLength

void setContentLength(int len)

Sets the length of the content body in the response In HTTP servlets, this method sets the HTTP Content-Length header. Parameters: len – an integer specifying the length of the content being returned to the client; sets the Content-Length header

setContentType

void setContentType(java.lang.String type)

Sets the content type of the response being sent to the client, if the response has not been committed yet. The given content type may include a character encoding specification, for example, text/html;charset=UTF-8 . The response’s character encoding is only set from the given content type if this method is called before getWriter is called. This method may be called repeatedly to change content type and character encoding. This method has no effect if called after the response has been committed. It does not set the response’s character encoding if it is called after getWriter has been called or after the response has been committed. Containers must communicate the content type and the character encoding used for the servlet response’s writer to the client if the protocol provides a way for doing so. In the case of HTTP, the Content-Type header is used. Parameters: type – a String specifying the MIME type of the content See Also: setLocale(java.util.Locale) , setCharacterEncoding(java.lang.String) , getOutputStream() , getWriter()

setBufferSize

void setBufferSize(int size)

Sets the preferred buffer size for the body of the response. The servlet container will use a buffer at least as large as the size requested. The actual buffer size used can be found using getBufferSize . A larger buffer allows more content to be written before anything is actually sent, thus providing the servlet with more time to set appropriate status codes and headers. A smaller buffer decreases server memory load and allows the client to start receiving data more quickly. This method must be called before any response body content is written; if content has been written or the response object has been committed, this method throws an IllegalStateException . Parameters: size – the preferred buffer size Throws: IllegalStateException – if this method is called after content has been written See Also: getBufferSize() , flushBuffer() , isCommitted() , reset()

getBufferSize

int getBufferSize()

Returns the actual buffer size used for the response. If no buffering is used, this method returns 0. Returns: the actual buffer size used See Also: setBufferSize(int) , flushBuffer() , isCommitted() , reset()

flushBuffer

void flushBuffer() throws java.io.IOException

Forces any content in the buffer to be written to the client. A call to this method automatically commits the response, meaning the status code and headers will be written. Throws: java.io.IOException See Also: setBufferSize(int) , getBufferSize() , isCommitted() , reset()

resetBuffer

void resetBuffer()

Clears the content of the underlying buffer in the response without clearing headers or status code. If the response has been committed, this method throws an IllegalStateException . Since: Servlet 2.3 See Also: setBufferSize(int) , getBufferSize() , isCommitted() , reset()

isCommitted

boolean isCommitted()

Returns a boolean indicating if the response has been committed. A committed response has already had its status code and headers written. Returns: a boolean indicating if the response has been committed See Also: setBufferSize(int) , getBufferSize() , flushBuffer() , reset()

reset

void reset()

Clears any data that exists in the buffer as well as the status code and headers. If the response has been committed, this method throws an IllegalStateException . Throws: IllegalStateException – if the response has already been committed See Also: setBufferSize(int) , getBufferSize() , flushBuffer() , isCommitted()

setLocale

void setLocale(java.util.Locale loc)

Sets the locale of the response, if the response has not been committed yet. It also sets the response’s character encoding appropriately for the locale, if the character encoding has not been explicitly set using setContentType(java.lang.String) or setCharacterEncoding(java.lang.String) , getWriter hasn’t been called yet, and the response hasn’t been committed yet. If the deployment descriptor contains a locale-encoding-mapping-list element, and that element provides a mapping for the given locale, that mapping is used. Otherwise, the mapping from locale to character encoding is container dependent. This method may be called repeatedly to change locale and character encoding. The method has no effect if called after the response has been committed. It does not set the response’s character encoding if it is called after setContentType(java.lang.String) has been called with a charset specification, after setCharacterEncoding(java.lang.String) has been called, after getWriter has been called, or after the response has been committed. Containers must communicate the locale and the character encoding used for the servlet response’s writer to the client if the protocol provides a way for doing so. In the case of HTTP, the locale is communicated via the Content-Language header, the character encoding as part of the Content-Type header for text media types. Note that the character encoding cannot be communicated via HTTP headers if the servlet does not specify a content type; however, it is still used to encode text written via the servlet response’s writer. Parameters: loc – the locale of the response See Also: getLocale() , setContentType(java.lang.String) , setCharacterEncoding(java.lang.String)

getLocale

java.util.Locale getLocale()

Returns the locale specified for this response using the setLocale(java.util.Locale) method. Calls made to setLocale after the response is committed have no effect. If no locale has been specified, the container’s default locale is returned. See Also: setLocale(java.util.Locale)

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Top 16 Setcontenttype 14659 Good Rating This Answer

việc sử dụng “response.setContentType (” text / html “)” trong servlet là gì

javax.servlet.http.HttpServletResponse.setContentType java code examples | Tabnine

Response trong Servlet – học servlet cơ bản đến nâng cao – Viettuts

java – what is the use of “response.setContentType(“text/html”)” in servlet – Stack Overflow

ServletResponse (Java EE 6 )

Java HttpServletResponse.setContentType Examples, javax.servlet.http.HttpServletResponse.setContentType Java Examples – HotExamples

IXpsOMCoreProperties::SetContentType (xpsobjectmodel.h) – Win32 apps | Microsoft Docs

setContentType

javax.servlet.ServletResponse#setContentType

javax.servlet.http.HttpServletResponse.setContentType java code examples

Response trong Servlet

” + title + “

ServletResponse (Java EE 6 )

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việc sử dụng “response.setContentType (” text / html “)” trong servlet là gì

javax.servlet.http.HttpServletResponse.setContentType java code examples | Tabnine

Response trong Servlet – học servlet cơ bản đến nâng cao – Viettuts

java – what is the use of “response.setContentType(“text/html”)” in servlet – Stack Overflow

ServletResponse (Java EE 6 )

Java HttpServletResponse.setContentType Examples, javax.servlet.http.HttpServletResponse.setContentType Java Examples – HotExamples

IXpsOMCoreProperties::SetContentType (xpsobjectmodel.h) – Win32 apps | Microsoft Docs

setContentType

javax.servlet.ServletResponse#setContentType

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javax.servlet.http.HttpServletResponse.setContentType java code examples

Response trong Servlet

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ServletResponse (Java EE 6 )

Leave a Comment Cancel reply

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