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rayln
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Jsonp跨域使用

阅读更多
Jsonp是解决跨域问题的一个办法。在jsonp:"callback"是对应后台返回的值使用的。

客户端页面代码： 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="uploadify/jquery.min.js"></script>
</head>
<body>

</body>
</html>

<script type="text/javascript">
	(function(){
		$.ajax({
			async: false,
			url:"http://16.165.53.40:8080/upload/ddsd.do",
			//url:"http://16.165.53.40:8080/upload/somejson",
			type:"get",
			dataType:"jsonp",
			jsonp:"callback",
			data:null,
			contentType:"application/json;utf-8",
			success: function(result){
				alert(11);
			},
			failure: function(){
				alert(222);
			}
		});
	})();
</script>



服务器接收代码： 
package com.file;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import org.apache.catalina.core.ApplicationContext;
import org.apache.tomcat.util.http.fileupload.FileItem;
import org.apache.tomcat.util.http.fileupload.FileItemFactory;
import org.apache.tomcat.util.http.fileupload.disk.DiskFileItemFactory;
import org.apache.tomcat.util.http.fileupload.servlet.ServletFileUpload;

public class UploadServlet implements Servlet {
	@Override
	public void destroy() {

	}

	@Override
	public ServletConfig getServletConfig() {
		return null;
	}

	@Override
	public String getServletInfo() {
		return null;
	}

	@Override
	public void init(ServletConfig arg0) throws ServletException {

	}

	@Override
	public void service(ServletRequest request, ServletResponse response)
			throws ServletException, IOException {
		String callback = request.getParameter("callback");
		System.out.println(request.getParameter("callback"));
		response.getWriter().print(callback+"({success:'successful'})");
	}
	private void createFolder(String path){
		File file = new File(path);
		if(!file.exists()){
			file.mkdirs();
		}
	}

}
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