SpringMvc完成ajax功能

1.加入jackson的jar包

2.在响应的方法上加上@ResponseBody：把java对象转化为json对象

3.方法的返回值可以是对象集合字符串

@Controller
@RequestMapping("ajax")
public class Ajaxcontroller {
    @RequestMapping("Ajax1")
    @ResponseBody
    public String example(String name) {
        System.out.println(name);        
        return "你好";
    }
    
    @RequestMapping("Ajax2")
    @ResponseBody
    public Users example2(String name) {
        System.out.println(name);
        Users user = new Users("张三","man",23);
        return user;
    }
    
    @RequestMapping("Ajax3")
    @ResponseBody
    public List<Users> example3(String name) {
        System.out.println(name);
        List<Users> list=new ArrayList<Users>();
        Users user1 = new Users("张三1","man",23);
        Users user2 = new Users("张三2","man",23);
        Users user3 = new Users("张三3","man",23);
        Users user4 = new Users("张三4","man",23);
        list.add(user1);
        list.add(user2);
        list.add(user3);
        list.add(user4);
        return list;
    }

4.返回字符串时会有乱码，解决办法

第一种：在@RequestMapping后写入(value="Ajax1",produces="text/html;charset=UTF-8")。代码如下：

@RequestMapping(value="Ajax1",produces="text/html;charset=UTF-8")
    @ResponseBody
    public String example(String name) {
        System.out.println(name);        
        return "你好";
    }

第二种：在springMVC配置文件中通过org.springframework.web.servlet.view.InternalResourceViewResolver类重写代码编码。代码如下：

    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg index="0" value="utf-8"></constructor-arg>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>