修改springmvc返回ajax方式的json資料

標籤：spring   攔截   

現在由這麼一個需求，就是修改幾個功能模組的springmvc的ajax請求傳回值（對傳回值加密），

因為controller很多，而且以前抱著開閉原則，這裡就選擇使用攔截器的方式（是Filter不是spring的handlerFilter）。廢話不多少，上代碼。（原始controller裡返回的都是json資料）。

1. 修改web.xml 添加filter

<filter>

<filter-name>jsonFilter</filter-name>

<filter-class>com.spr.util.UpdateJsonFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>jsonFilter</filter-name>

<url-pattern>/android/*</url-pattern><!-- 只攔截這個請求路徑下的action-->

</filter-mapping>

2.處理類

package com.spr.util;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpServletResponseWrapper;

import net.sf.json.JSONObject;

import org.apache.commons.lang3.StringUtils;

import org.springframework.http.HttpStatus;

public class UpdateJsonFilter implements Filter {

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

ByteResponseWrapper brw = new ByteResponseWrapper(

(HttpServletResponse) response);

chain.doFilter(request, brw);

String out = new String(brw.getBytes());

if (!StringUtils.isBlank(out)) {

            //處理加密的業務（略過）

out = out.toString();

} else {

out = "";

}

response.setContentType("application/json; charset=utf-8");

response.setContentLength(out.getBytes().length);

response.getOutputStream().write(out.getBytes());

}

public void destroy() {

}

public void init(FilterConfig filterConfig) {

}

static class ByteResponseWrapper extends HttpServletResponseWrapper {

private PrintWriter writer;

private ByteOutputStream output;

private int code = 200;

public byte[] getBytes() {

writer.flush();

return output.getBytes();

}

public ByteResponseWrapper(HttpServletResponse response) {

super(response);

output = new ByteOutputStream();

writer = new PrintWriter(output);

}

@Override

public PrintWriter getWriter() {

return writer;

}

@Override

public ServletOutputStream getOutputStream() throws IOException {

return output;

}

public int getStatus() {

return code;

}

public void sendRedirect(String location) throws IOException {

code = HttpStatus.MOVED_TEMPORARILY.value();

super.sendRedirect(location);

}

@Override

public void setStatus(int sc) {

this.code = sc;

}

@Override

public void setStatus(int sc, String message) {

this.code = sc;

}

@Override

public void sendError(int sc) throws IOException {

this.code = sc;

}

@Override

public void sendError(int sc, String msg) throws IOException {

this.code = sc;

}

}

static class ByteOutputStream extends ServletOutputStream {

private ByteArrayOutputStream bos = new ByteArrayOutputStream();

@Override

public void write(int b) throws IOException {

bos.write(b);

}

public byte[] getBytes() {

return bos.toByteArray();

}

}

}

本文出自 “重新來學JAVA” 部落格，請務必保留此出處http://3131854.blog.51cto.com/3121854/1637831

修改springmvc返回ajax方式的json資料