#Ajax跨域设置服务端请求头

#Ajax跨域设置服务端请求头

ONE. Servlet配置
- 1. 设置options的返回头

@Override
protected void doOptions(HttpServletRequest
arg0,HttpServletResponse resp) throws ServletException, IOException {
resp.setHeader(“Access-Control-Allow-Origin”, “*”);
}

– 2. 设置doPost,doGet返回头

@Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setHeader(“Access-Control-Allow-Origin”, “*”);
}

TWO. SpringMVC配置

package com.test.controller;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
/**
* @author Kang
* [e-mail]
* @date 20160520
* @description 跨域文件上传处理
* 1. 以下处理方式
* 2. 使用拦截器,在返回处理中设置resp.setHeader(“Access-Control-Allow-Origin”,”*”);
*/
@Controller
public class UploadController {
/*
*须在初始化DispatcherServlet,initParam(dispatchOptionsRequest为true)
*config:
* <!--spring config-->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/springmvc-servlet.xml</param-value>
</init-param>
<init-param>
<param-name>dispatchOptionsRequest</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
*
* @param resp
*/
@RequestMapping(value=”uploadController”,method ={RequestMethod.OPTIONS})
public void uploadReqOPTIONS(HttpServletResponse resp){
setAccessControlAllowOrginTrue(resp);
}
@RequestMapping(value=”uploadController”,method ={RequestMethod.GET,RequestMethod.POST})
public void upload(HttpServletResponse resp){
PrintWriter out = null;
try {
setAccessControlAllowOrginTrue(resp);
out = resp.getWriter();
out.print(“true”);
} catch (IOException e) {
e.printStackTrace();
}finally{
if(out!=null)
out.close();
}
System.out.println(“upload accessed”);
}
/**
* 跨域设置Access-Control-Allow-Orgin为*
* @param resp
* @return
*/
private void setAccessControlAllowOrginTrue(HttpServletResponse resp){
resp.setHeader(“Access-Control-Allow-Origin”,”*”);
}
}