SpringMVC之jackjson的使用

第一步：下載並導入jackson-all-1.9.0.jar包， 如需要請添加QQ：1792099653，請備注“jackson”

第二步：解決亂碼問題， 在dispatcher-servlet.xml中配置 如下代碼

 

<!--json格式解決亂碼問題-->
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes">
                    <list>
                        <value>text/html;charset=UTF-8</value>
                        <value>application/json;charset=UTF-8</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

 

第三步：編寫工具類 utils工具類：避免代碼的復用

import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;

import java.io.IOException;
import java.text.SimpleDateFormat;

public class utiles {
    public static String getJson(Object object){
        return getJson(object, "yyyy-MM-dd HH:mm:ss");
    }

    public static String getJson(Object obj, String dateformat){
        ObjectMapper mapper = new ObjectMapper();

        // 自定義日期格式
        mapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);
        SimpleDateFormat sdf = new SimpleDateFormat(dateformat);
        mapper.setDateFormat(sdf);

        try {
            return mapper.writeValueAsString(obj);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }
}

第四步：編寫Controller文件，其中有個自行創建的User實體類

User實體類代碼

 

public class User {
    private String name;
    private int age;
    private int id;

    public User(){}

    public User(String name, int age, int id) {
        this.name = name;
        this.age = age;
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
}

 

 

 

Controller代碼

import com.springmvc.app.dao.User;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.springmvc.app.utils.utiles;

//@Controller
@RestController
public class UserController {

    @RequestMapping("/json1")
//    @ResponseBody //他就不會走視圖解析器，會直接返回一個字符串
    public String json1() throws IOException {

        //創建一個對象
        User user = new User("劉洋銘", 15, 1);

        return utiles.getJson(user);
    }

    @RequestMapping("json2")
    public String json2() throws IOException {
        //創建一個集合
        List<User> userList = new ArrayList<User>();

        //創建四個對象
        User user1 = new User("劉洋銘1", 15, 1);
        User user2 = new User("劉洋銘2", 15, 1);
        User user3 = new User("劉洋銘3", 15, 1);
        User user4 = new User("劉洋銘4", 15, 1);

        userList.add(user1);
        userList.add(user2);
        userList.add(user3);
        userList.add(user4);

        return utiles.getJson(userList);
    }

    @RequestMapping("json3")
    public String json3() throws IOException {

        Date date = new Date();
        return utiles.getJson(date);
    }

}

 

下面是我個人的項目代碼  結構 視圖，讓大家少走彎路

 

以上就是全部步驟，希望能幫到各位