本文主要是介绍spring mvc3.1 @ResponseBody注解生成大量Accept-Charset，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
Spring3 MVC使用@ResponseBody后会产生很大的响应头(Accept-Charset会达到4K+)，原因在于默认情况下StringHttpMessageConverter.writeInternal()会将所有可用字符集回写到response响应头中：问题来了
解决方式：
一般我们都会重写springs mvc的HttpMessageConverter，改为utf-8编码：
package com.goldpalm.core.spring.mvc;import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;import org.springframework.http.HttpInputMessage;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.AbstractHttpMessageConverter;
import org.springframework.util.FileCopyUtils;/*** 重写SpringMVC的字符串转换器，使用UTF-8编码* @since 2012-7-5 下午2:28:19* @author Jesse Lu*/
public class UTF8StringHttpMessageConverter extends AbstractHttpMessageConverter<String> {public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");private final List<Charset> availableCharsets;private boolean writeAcceptCharset = true;public UTF8StringHttpMessageConverter() {super(new MediaType("text", "plain", DEFAULT_CHARSET), MediaType.ALL);this.availableCharsets = new ArrayList<Charset>(Charset.availableCharsets().values());}/*** Indicates whether the {@code Accept-Charset} should be written to any outgoing request.* <p>* Default is {@code true}.*/public void setWriteAcceptCharset(boolean writeAcceptCharset) {this.writeAcceptCharset = writeAcceptCharset;}@Overridepublic boolean supports(Class<?> clazz) {return String.class.equals(clazz);}@SuppressWarnings("rawtypes")@Overrideprotected String readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException {Charset charset = getContentTypeCharset(inputMessage.getHeaders().getContentType());return FileCopyUtils.copyToString(new InputStreamReader(inputMessage.getBody(), charset));}@Overrideprotected Long getContentLength(String s, MediaType contentType) {Charset charset = getContentTypeCharset(contentType);try {return (long) s.getBytes(charset.name()).length;} catch (UnsupportedEncodingException ex) {// should not occurthrow new InternalError(ex.getMessage());}}@Overrideprotected void writeInternal(String s, HttpOutputMessage outputMessage) throws IOException {if (writeAcceptCharset) {outputMessage.getHeaders().setAcceptCharset(getAcceptedCharsets());}Charset charset = getContentTypeCharset(outputMessage.getHeaders().getContentType());FileCopyUtils.copy(s, new OutputStreamWriter(outputMessage.getBody(), charset));}/*** Return the list of supported {@link Charset}.* <p>* By default, returns {@link Charset#availableCharsets()}. Can be overridden in subclasses.* @return the list of accepted charsets*/protected List<Charset> getAcceptedCharsets() {return this.availableCharsets;}private Charset getContentTypeCharset(MediaType contentType) {if (contentType != null && contentType.getCharSet() != null) {return contentType.getCharSet();} else {return DEFAULT_CHARSET;}}}
在xm中配置：注意红色圈起来的配置
<mvc:annotation-driven><mvc:message-converters><bean class="com.goldpalm.core.spring.mvc.UTF8StringHttpMessageConverter"><property name="writeAcceptCharset" value="false" /></bean></mvc:message-converters></mvc:annotation-driven>
这篇关于spring mvc3.1 @ResponseBody注解生成大量Accept-Charset的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
