在Java项目中將一个对象转换成一段Json花样的字符串黑白经常见的，能够完成这类需求的东西包也比较多，比方Gson、JSON-lib、Jackson等等。本文重要引见Jackson的运用，Jackson除了能完成Java对象与Json串的互转外，还能將Java对象转换为Xml花样，运用较为简朴而且听说效力比较高。
关于Jackson的jar包我们能够从maven资源库中下载：http://www.ki4.cn/
所需jar包以下，根据称号搜刮下载即可。
接下来编写测试用例，我们须要一个java类：
package com.csii.jackson.object;
public class Book{
private String name;
private int price;
public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getPrice() {
return price;
} public void setPrice(int price) {
this.price = price;
} public Book() {
} public Book(String name,int price) {
this.name = name;
this.price = price;
}
@Override
public String toString() {
return "name:" + name +"; price:" + price;
}
}
1.將Java对象转换为Json字符串：
@Test public void testGenJson()
{
ObjectMapper objMapper = new ObjectMapper();
Book book = new Book("Think in Java",100); try {
jsonGen = objMapper.getJsonFactory().createJsonGenerator(System.out,JsonEncoding.UTF8);
jsonGen.writeObject(book);
} catch (IOException e) {
e.printStackTrace();
}
}
运转测试要领，控制台输出：
{"name":"Think in Java","price":100}
2.將Json字符串转为Java对象：
/*
* Json转Java对象
*/
@Test public void testGenObjByJson()
{
ObjectMapper objMapper = new ObjectMapper();
String json = "{\"name\":\"Think in Java\",\"price\":100}";
try {
Book book = objMapper.readValue(json, Book.class);
System.out.println(book);
} catch (IOException e) {
e.printStackTrace();
}
}
因为我们重写了Book类的toString要领，运转测试要领，控制台输出：
name:Think in Java; price:100
3.將Java对象转为Xml花样：
/*
* Java对象转xml
*/
@Test public void testGenXml()
{
XmlMapper xmlMapper = new XmlMapper();
Book book = new Book("Think in Java",100); try {
String xmlStr = xmlMapper.writeValueAsString(book);
System.out.println(xmlStr);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
}
运转测试要领，控制台输出：
<Book xmlns=""><name>Think in Java</name><price>100</price></Book>
4.將xml花样字符串转为Java对象：
/*
* xml转Java对象
*/
@Test public void testGenObjByXml()
{
XmlMapper xmlMapper = new XmlMapper();
String xmlStr = "<Book><name>Think in Java</name><price>100</price></Book>";
try {
Book book = xmlMapper.readValue(xmlStr, Book.class);
System.out.println(book);
} catch (IOException e) { // TODO Auto-generated catch block
e.printStackTrace();
}
}
输出内容：
name:Think in Java; price:100
完全的测试用例代码：
package com.csii.jackson.test;
import java.io.IOException;
import org.junit.Test;
import com.csii.jackson.object.Book;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
@SuppressWarnings("deprecation")
public class JsonTest {
private JsonGenerator jsonGen = null;
/*
* Java对象转 Json
*/
@Test
public void testGenJson()
{
ObjectMapper objMapper = new ObjectMapper();
Book book = new Book("Think in Java",100);
try {
jsonGen = objMapper.getJsonFactory().createJsonGenerator(System.out,JsonEncoding.UTF8);
jsonGen.writeObject(book);
} catch (IOException e) {
e.printStackTrace();
}
} /*
* Json转Java对象
*/
@Test
public void testGenObjByJson()
{
ObjectMapper objMapper = new ObjectMapper();
String json = "{\"name\":\"Think in Java\",\"price\":100}";
try {
Book book = objMapper.readValue(json, Book.class);
System.out.println(book);
} catch (IOException e) {
e.printStackTrace();
}
} /*
* Java对象转xml
*/
@Test
public void testGenXml()
{
XmlMapper xmlMapper = new XmlMapper();
Book book = new Book("Think in Java",100);
try {
String xmlStr = xmlMapper.writeValueAsString(book);
System.out.println(xmlStr);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
} /*
* xml转Java对象
*/
@Test
public void testGenObjByXml()
{
XmlMapper xmlMapper = new XmlMapper();
String xmlStr = "<Book><name>Think in Java</name><price>100</price></Book>";
try {
Book book = xmlMapper.readValue(xmlStr, Book.class);
System.out.println(book);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
在Java项目中將一个对象转换成一段Json花样的字符串黑白经常见的，能够完成这类需求的东西包也比较多，比方Gson、JSON-lib、Jackson等等。本文重要引见Jackson的运用，Jackson除了能完成Java对象与Json串的互转外，还能將Java对象转换为Xml花样，运用较为简朴而且听说效力比较高。
关于Jackson的jar包我们能够从maven资源库中下载：http://www.ki4.cn/
所需jar包以下，根据称号搜刮下载即可。
接下来编写测试用例，我们须要一个java类：
package com.csii.jackson.object;
public class Book{
private String name;
private int price;
public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public int getPrice() {
return price;
} public void setPrice(int price) {
this.price = price;
} public Book() {
} public Book(String name,int price) {
this.name = name;
this.price = price;
}
@Override
public String toString() {
return "name:" + name +"; price:" + price;
}
}
1.將Java对象转换为Json字符串：
@Test public void testGenJson()
{
ObjectMapper objMapper = new ObjectMapper();
Book book = new Book("Think in Java",100); try {
jsonGen = objMapper.getJsonFactory().createJsonGenerator(System.out,JsonEncoding.UTF8);
jsonGen.writeObject(book);
} catch (IOException e) {
e.printStackTrace();
}
}
运转测试要领，控制台输出：
{"name":"Think in Java","price":100}
2.將Json字符串转为Java对象：
/*
* Json转Java对象
*/
@Test public void testGenObjByJson()
{
ObjectMapper objMapper = new ObjectMapper();
String json = "{\"name\":\"Think in Java\",\"price\":100}";
try {
Book book = objMapper.readValue(json, Book.class);
System.out.println(book);
} catch (IOException e) {
e.printStackTrace();
}
}
因为我们重写了Book类的toString要领，运转测试要领，控制台输出：
name:Think in Java; price:100
3.將Java对象转为Xml花样：
/*
* Java对象转xml
*/
@Test public void testGenXml()
{
XmlMapper xmlMapper = new XmlMapper();
Book book = new Book("Think in Java",100); try {
String xmlStr = xmlMapper.writeValueAsString(book);
System.out.println(xmlStr);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
}
运转测试要领，控制台输出：
<Book xmlns=""><name>Think in Java</name><price>100</price></Book>
4.將xml花样字符串转为Java对象：
/*
* xml转Java对象
*/
@Test public void testGenObjByXml()
{
XmlMapper xmlMapper = new XmlMapper();
String xmlStr = "<Book><name>Think in Java</name><price>100</price></Book>";
try {
Book book = xmlMapper.readValue(xmlStr, Book.class);
System.out.println(book);
} catch (IOException e) { // TODO Auto-generated catch block
e.printStackTrace();
}
}
输出内容：
name:Think in Java; price:100
完全的测试用例代码：
package com.csii.jackson.test;
import java.io.IOException;
import org.junit.Test;
import com.csii.jackson.object.Book;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
@SuppressWarnings("deprecation")
public class JsonTest {
private JsonGenerator jsonGen = null;
/*
* Java对象转 Json
*/
@Test
public void testGenJson()
{
ObjectMapper objMapper = new ObjectMapper();
Book book = new Book("Think in Java",100);
try {
jsonGen = objMapper.getJsonFactory().createJsonGenerator(System.out,JsonEncoding.UTF8);
jsonGen.writeObject(book);
} catch (IOException e) {
e.printStackTrace();
}
} /*
* Json转Java对象
*/
@Test
public void testGenObjByJson()
{
ObjectMapper objMapper = new ObjectMapper();
String json = "{\"name\":\"Think in Java\",\"price\":100}";
try {
Book book = objMapper.readValue(json, Book.class);
System.out.println(book);
} catch (IOException e) {
e.printStackTrace();
}
} /*
* Java对象转xml
*/
@Test
public void testGenXml()
{
XmlMapper xmlMapper = new XmlMapper();
Book book = new Book("Think in Java",100);
try {
String xmlStr = xmlMapper.writeValueAsString(book);
System.out.println(xmlStr);
} catch (JsonProcessingException e) {
e.printStackTrace();
}
} /*
* xml转Java对象
*/
@Test
public void testGenObjByXml()
{
XmlMapper xmlMapper = new XmlMapper();
String xmlStr = "<Book><name>Think in Java</name><price>100</price></Book>";
try {
Book book = xmlMapper.readValue(xmlStr, Book.class);
System.out.println(book);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
以上就是Java对象、Json、Xml转换东西Jackson运用的内容，更多相关内容请关注ki4网（www.ki4.cn）！
