Ajax学习（3）Jackson使用

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下载Jackson：点击下载Jackson库

package com.atguigu.ajax.app.test;import java.io.IOException;import org.codehaus.jackson.JsonGenerationException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;public class Customer {    private int id;    private String name;    public Customer(int id, String name) {        this.id = id;        this.name = name;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getCity(){        return "fuzhou";    }    public String getBirth(){        return "1991-12-29";    }    public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException {        /**         * 1.导入jar包         * 2.创建ObjectMappter对象         * 3.调用mapper的writeValueAsString         * 4.注意：jackson使用getter方法来定位JSON对象属性         *  可以通过添加注解org.codehaus.jackson.annotate.JsonIgnore         *  来忽略某一个getter定义的属性         */        ObjectMapper mapper = new ObjectMapper();        Customer customer = new Customer(1001, "AtGuigu");        String jsonStr = mapper.writeValueAsString(customer);        System.out.println(jsonStr);    }}

输出：

{"id":1001,"name":"AtGuigu","city":"fuzhou","birth":"1991-12-29"}

package com.atguigu.ajax.app.test;import java.io.IOException;import org.codehaus.jackson.JsonGenerationException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;public class Customer {    private int id;    private String name;    public Customer(int id, String name) {        this.id = id;        this.name = name;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    //修改getName-->getCustomerName    public String getCustomerName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getCity(){        return "fuzhou";    }    public String getBirth(){        return "1991-12-29";    }    public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException {        /**         * 1.导入jar包         * 2.创建ObjectMappter对象         * 3.调用mapper的writeValueAsString         * 4.注意：jackson使用getter方法来定位JSON对象属性         *  可以通过添加注解org.codehaus.jackson.annotate.JsonIgnore         *  来忽略某一个getter定义的属性         */        ObjectMapper mapper = new ObjectMapper();        Customer customer = new Customer(1001, "AtGuigu");        String jsonStr = mapper.writeValueAsString(customer);        System.out.println(jsonStr);    }}

输出：

{"id":1001,"customerName":"AtGuigu","city":"fuzhou","birth":"1991-12-29"}

package com.atguigu.ajax.app.test;import java.io.IOException;import org.codehaus.jackson.JsonGenerationException;import org.codehaus.jackson.annotate.JsonIgnore;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;public class Customer {    private int id;    private String name;    public Customer(int id, String name) {        this.id = id;        this.name = name;    }    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getCustomerName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getCity(){        return "fuzhou";    }    //添加@JsonIgnore    @JsonIgnore    public String getBirth(){        return "1991-12-29";    }    public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException {    /**         * 1.导入jar包         * 2.创建ObjectMappter对象         * 3.调用mapper的writeValueAsString         * 4.注意：jackson使用getter方法来定位JSON对象属性         *  可以通过添加注解org.codehaus.jackson.annotate.JsonIgnore         *  来忽略某一个getter定义的属性         */        ObjectMapper mapper = new ObjectMapper();        Customer customer = new Customer(1001, "AtGuigu");        String jsonStr = mapper.writeValueAsString(customer);        System.out.println(jsonStr);    }}

输出：

{"id":1001,"city":"fuzhou","customerName":"AtGuigu"}

Json工具类

package com.zzy.json;import java.io.IOException;import org.codehaus.jackson.JsonGenerationException;import org.codehaus.jackson.JsonParseException;import org.codehaus.jackson.map.JsonMappingException;import org.codehaus.jackson.map.ObjectMapper;import com.zzy.model.Person;import com.zzy.model.Phone;/** * JsonUtil.java 说明：json工具类 *  * @author zhengzy * @date 2015年9月25日 */public class JsonUtils {    public static <T> T fromJson(String strJson, Class<T> className) {        try {            return new ObjectMapper().readValue(strJson, className);        } catch (JsonParseException e) {            e.printStackTrace();        } catch (JsonMappingException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return null;    }    public static String toJson(Object obj) {        try {            return new ObjectMapper().writeValueAsString(obj);        } catch (JsonGenerationException e) {            e.printStackTrace();        } catch (JsonMappingException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return null;    }    public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {        /**         * model需要空的构造函数         */        Person person = new Person(1, "xiaoming", new Phone("0594", "1234567890"));        System.out.println(JsonUtils.toJson(person));        Person person2 = JsonUtils.fromJson(JsonUtils.toJson(person), Person.class);        System.out.println(person2.toString());    }}

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