spring mvc对Json的支持

1.设置spring-mvc.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<!-- 使用注解的包，包括子集 -->
<context:component-scan base-package="com.java1234"/>

<!-- 支持对象与json的转换。 -->
<mvc:annotation-driven/>

<!-- 视图解析器 -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/" />
<property name="suffix" value=".jsp"></property>
</bean>

</beans>

2.加jackSon的jar包













3.import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.java1234.model.User;

@Controller
@RequestMapping("/user")
public class UserController {

@RequestMapping("/ajax")
public @ResponseBody User ajax(){
User user=new User("zhangsan","123");
return user;
}
}
其中的@ResponseBody是将数据转化为json格式

但还是一般都会自己写个util来实现：
import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

public class ResponseUtil {

public static void write(HttpServletResponse response,Object o)throws Exception{
response.setContentType("text/html;charset=utf-8");
PrintWriter out=response.getWriter();
out.println(o.toString());
out.flush();
out.close();
}
}