Object处理方法的返回值
创建一个User实体类，并在其中写上属性值，并将其进行封装：
public class User {
private String name;
private int age;
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
首先创建一个包，并在该包中创建一个类，并写上返回值为Object的方法
@Controller
public class Firstconobjectreturn {
@RequestMapping("/ent")
@ResponseBody //响应体
public Object doFirst(){
return 1;
}
//处理器返回值 Map
@RequestMapping(value = "/pent"，produces = "text/html;charset=utf-8") //解决乱码
@ResponseBody
public Object doSecond(){
Map<String,User> map=new HashMap<String, User>();
User info=new User();
info.setName("赵天宇");
info.setAge(20);
User us=new User();
info.setName("毛不易");
us.setAge(22);
map.put(info.getName(),info);
map.put(us.getName(),us);
return map;
}
//处理器返回值 List
@RequestMapping(value = "/lit")
@ResponseBody
public Object doList(){
List<User> list=new ArrayList<User>();
User info=new User();
info.setName("孟子坤");
info.setAge(17);
return list;
}
@RequestMapping("/yun")
@ResponseBody
public Object dopecond(){
User info=new User();
info.setName("啦啦");
info.setAge(23);
return info;
}
}
在xml中必须要加上<mvc:annotation-drivern/>
<context:component-scan base-package="cn.happy.conobject"></context:component-scan> <mvc:annotation-driven/>
创建一个jsp页面，并在该页面中写上如下代码：
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jQuery1.11.1.js"></script>
<script type="text/javascript">
$(function () {
$("#tn").click(function () {
$.ajax({
url:"${pageContext.request.contextPath}/pent",
success:function (data) { //data指的是从server打印到浏览器的数据
$.each(data,function (i,dom) {
alert(dom.name);
})
/* alert(data);*/
}
});
});
});
</script>
</head>
<body>
<h3>ResponseBody</h3>
<input type="button" id="tn" value="Ajax"/>
</body>
</html>
------------------------SpringMVC核心技术 转发，重定向---------------------------
重定向：不能携带数据
转发：携带数据
@Controller
public class twocontroller {
//SpringMVC 转发
@RequestMapping("/addUser") //转发视图
public String addRealUser(){
return "/WEB-INF/insert.jsp";
}
@RequestMapping("/listUser")
public String lidtUder(HttpServletRequest request){ //转发处理器
request.setAttribute("happy","goodgril");
return "addUser";
}
//------------------------重定向-----------------------
@RequestMapping("/addent")
public String alist(){
return "redirect:/list.jsp";
}
@RequestMapping("/addlist")
public String addli(HttpServletRequest request){
request.setAttribute("happy","goodgril");
return "redirect:/addent";
}
//------------------------异常------------------------------
@RequestMapping("/err")
public String doErr(){
int i=5/0;
return "/WEB-INF/list.jsp";
}
}
xml配置中的异常操作如下：
<!--注册系统异常处理器-->
<bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="defaultErrorView" value="errer.jsp"></property>
</bean>
