溫馨提示×
您好，登錄后才能下訂單哦！
點(diǎn)擊 登錄注冊(cè) 即表示同意《億速云用戶服務(wù)條款》
您好，登錄后才能下訂單哦！
如何使用Jackson工具對(duì)Java對(duì)象、Json和Xml進(jìn)行轉(zhuǎn)換？針對(duì)這個(gè)問(wèn)題，這篇文章給出了相對(duì)應(yīng)的分析和解答，希望能幫助更多想解決這個(gè)問(wèn)題的朋友找到更加簡(jiǎn)單易行的辦法。
在Java項(xiàng)目中將一個(gè)對(duì)象轉(zhuǎn)換成一段Json格式的字符串是非常常見的，能夠?qū)崿F(xiàn)這種需求的工具包也比較多，例如Gson、JSON-lib、Jackson等等。本文主要介紹Jackson的使用，Jackson除了能實(shí)現(xiàn)Java對(duì)象與Json串的互轉(zhuǎn)外，還能將Java對(duì)象轉(zhuǎn)換為Xml格式，使用較為簡(jiǎn)單而且據(jù)說(shuō)效率比較高。
對(duì)于Jackson的jar包我們可以從maven資源庫(kù)中下載：http://www.php.cn/
所需jar包如下，按照名稱搜索下載即可。
接下來(lái)編寫測(cè)試用例，我們需要一個(gè)java類：
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對(duì)象轉(zhuǎn)換為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();
}
}運(yùn)行測(cè)試方法，控制臺(tái)輸出：
{"name":"Think in Java","price":100}2.將Json字符串轉(zhuǎn)為Java對(duì)象：
/*
* Json轉(zhuǎn)Java對(duì)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();
}
}由于我們重寫了Book類的toString方法，運(yùn)行測(cè)試方法，控制臺(tái)輸出：
name:Think in Java; price:100
3.將Java對(duì)象轉(zhuǎn)為Xml格式：
/*
* Java對(duì)象轉(zhuǎn)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();
}
}運(yùn)行測(cè)試方法，控制臺(tái)輸出：
<Book xmlns=""><name>Think in Java</name><price>100</price></Book>
4.將xml格式字符串轉(zhuǎn)為Java對(duì)象：
/*
* xml轉(zhuǎn)Java對(duì)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();
}
}輸出內(nèi)容：
name:Think in Java; price:100
完整的測(cè)試用例代碼：
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對(duì)象轉(zhuǎn) 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轉(zhuǎn)Java對(duì)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對(duì)象轉(zhuǎn)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轉(zhuǎn)Java對(duì)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項(xiàng)目中將一個(gè)對(duì)象轉(zhuǎn)換成一段Json格式的字符串是非常常見的，能夠?qū)崿F(xiàn)這種需求的工具包也比較多，例如Gson、JSON-lib、Jackson等等。本文主要介紹Jackson的使用，Jackson除了能實(shí)現(xiàn)Java對(duì)象與Json串的互轉(zhuǎn)外，還能將Java對(duì)象轉(zhuǎn)換為Xml格式，使用較為簡(jiǎn)單而且據(jù)說(shuō)效率比較高。
對(duì)于Jackson的jar包我們可以從maven資源庫(kù)中下載：http://www.php.cn/
所需jar包如下，按照名稱搜索下載即可。
接下來(lái)編寫測(cè)試用例，我們需要一個(gè)java類：
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對(duì)象轉(zhuǎn)換為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();
}
}運(yùn)行測(cè)試方法，控制臺(tái)輸出：
{"name":"Think in Java","price":100}2.將Json字符串轉(zhuǎn)為Java對(duì)象：
/*
* Json轉(zhuǎn)Java對(duì)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();
}
}由于我們重寫了Book類的toString方法，運(yùn)行測(cè)試方法，控制臺(tái)輸出：
name:Think in Java; price:100
3.將Java對(duì)象轉(zhuǎn)為Xml格式：
/*
* Java對(duì)象轉(zhuǎn)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();
}
}運(yùn)行測(cè)試方法，控制臺(tái)輸出：
<Book xmlns=""><name>Think in Java</name><price>100</price></Book>
4.將xml格式字符串轉(zhuǎn)為Java對(duì)象：
/*
* xml轉(zhuǎn)Java對(duì)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();
}
}輸出內(nèi)容：
name:Think in Java; price:100
完整的測(cè)試用例代碼：
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對(duì)象轉(zhuǎn) 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轉(zhuǎn)Java對(duì)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對(duì)象轉(zhuǎn)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轉(zhuǎn)Java對(duì)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();
}
}
}以上就是使用Jackson工具對(duì)Java對(duì)象、Json和Xml進(jìn)行轉(zhuǎn)換的方法，詳細(xì)使用情況還需要大家自己親自動(dòng)手使用過(guò)才能領(lǐng)會(huì)。如果想了解更多相關(guān)內(nèi)容，歡迎關(guān)注億速云行業(yè)資訊頻道！
免責(zé)聲明：本站發(fā)布的內(nèi)容（圖片、視頻和文字）以原創(chuàng)、轉(zhuǎn)載和分享為主，文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng)，如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱：is@yisu.com進(jìn)行舉報(bào)，并提供相關(guān)證據(jù)，一經(jīng)查實(shí)，將立刻刪除涉嫌侵權(quán)內(nèi)容。
億速云公眾號(hào)
手機(jī)網(wǎng)站二維碼