Spring 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:
去除这些信息我们可以这样,定义一个拦截器:
package cn.krun.cup.pojo;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;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; } @Override public boolean supports(Class<?> 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 {@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; } }
}
然后在spring中配置
<mvc:annotation-driven> <mvc:message-converters> <bean class="cn.krun.cup.pojo.UTF8StringHttpMessageConverter"> <property name="writeAcceptCharset" value="false"> </property> </bean> </mvc:message-converters> </mvc:annotation-driven>
Done!
欢迎来到这里!
我们正在构建一个小众社区,大家在这里相互信任,以平等 • 自由 • 奔放的价值观进行分享交流。最终,希望大家能够找到与自己志同道合的伙伴,共同成长。
注册 关于