spring mvc3.1 @ResponseBody註解生成大量Accept-Charset
Spring3 [email protected](Accept-Charset會達到4K+)。原因在於默認情況下StringHttpMessageConverter.writeInternal()會將全部可用字符集回寫到response響應頭中：問題來了
解決方案：
一般我們都會重寫springs mvc的HttpMessageConverter。改為utf-8編碼：
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;
/**
* 重寫SpringMVC的字符串轉換器。使用UTF-8編碼
* @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 [email protected]> clazz) { return String.class.equals(clazz); } @SuppressWarnings("rawtypes") @Override protected String readInternal(Class clazz, HttpInputMessage inputMessage) throws IOException { Charset charset = getContentTypeCharset(inputMessage.getHeaders().getContentType()); return FileCopyUtils.copyToString(new InputStreamReader(inputMessage.getBody(), charset)); } @Override protected Long getContentLength(String s, MediaType contentType) { Charset charset = getContentTypeCharset(contentType); try { return (long) s.getBytes(charset.name()).length; } catch (UnsupportedEncodingException ex) { // should not occur throw new InternalError(ex.getMessage()); } } @Override protected 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 [email protected]
