jsonp实现ajax跨域访问配置

首先来写login.html

<!DOCTYPEhtml>
<html>
<head>
<title>prictice.html</title>
<Metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/>
<linkrel="stylesheet"href="jquery.mobile-1.4.5/jquery.mobile-1.4.5.css">
	<scriptsrc="js/jquery-1.9.1.js"></script>
	<scripttype="text/javascript"src="jquery.mobile-1.4.5/jquery.mobile-1.4.5.js"></script>
	<scripttype="text/javascript"src="js/login.js"></script>
</head>
<body>
	<divdata-role="head"></div>
	<divdata-role="content">
	<divstyle="text-align:center;">
		<imgsrc="image/grid_knowledge.png"alt="logo"/>
	</div>
	<div>
	
		<span>用户名：</span><inputid="username"type="text">
		<sapn>密码：</sapn><inputid="password"type="password">
		<divdata-role="controlgroup"data-type="horizontal"style="text-align:center;">
			<buttonid="login"inline="true">登陆</button>
			<buttonid="regist"inline="true">注册</button>
		</div>
	</div>
	</div>
	<divdata-role="footer"data-position="fixed"style="text-align:center;">版本</div>
</body>
</html>

然后来看下login.js

$(function(){
	$.support.cors=true;
	$.mobile.allowCrossDomainPages=true;
	$('#login').click(function(){
		varuserName=$('#username').val();
		varpasswd=$('#password').val();
		//alert(userName+""+passwd);
		$.ajax({
			type:"POST",url:"http://127。0.0.1:8080/sfw/testjsonp",dataType:"jsonp",//这里是重点
			jsonp:"callback",//这里是重点
			jsonpCallback:"handler",//这里是重点
			//context:this,contentType:"application/json;charset=UTF-8",data:{username:userName,passwd:passwd},async:true,success:function(data){
				alert("loginsuccess!");
				//$(this).alert("3333");
			}
		});
		functionhandler(data){//回调函数
			alert("good");
		}
	})
	
})

```
再看下struts配置
```

<packagename="json"extends="json-default">
	<actionname="testjsonp"class="cn.framework.action.TestJsonp"method="testAction">
		<resulttype="json">
		</result>
</action>
		
	</package>

```
最后看下action
```

packagecn.framework.action;

importjava.io.IOException;

importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importorg.apache.struts2.ServletActionContext;

publicclassTestJsonpextendsBaseAction{
	privatestaticfinallongserialVersionUID=1L;
	publicStringtestAction(){
		HttpServletRequestrequest=ServletActionContext.getRequest();
		HttpServletResponseres=ServletActionContext.getResponse();
		Stringusername=request.getParameter("username");
		Stringpassword=request.getParameter("passwd");
		Stringfunc=request.getParameter("callback");
		System.out.println("username:"+username+"password:"+password);
		StringBuffers=newStringBuffer();
		s.append(func);
		s.append("({\"username\":\"");
		s.append(username);
		s.append("\",");
		s.append("\"password\":\"");
		s.append(password);
		s.append("\"})");
		try{
			res.getWriter().write(s.toString());
			res.getWriter().flush();
		}catch(IOExceptione){
			e.printStackTrace();
		}
		returnnull;
	}
	
}

总结:有二点需要注意，一个是js中的dataType,还有jsonp的属性。另一个是返回的json数据的格式是一个带json数据的方法名handler({"username":"aaa","password","bbb"})

原文链接：https://www.f2er.com/json/289761.html

jsonp实现ajax跨域访问配置

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