如何使用Jackson工具对Java对象、Json和Xml进行转换?针对这个问题,这篇文章给出了相对应的分析和解答,希望能帮助更多想解决这个问题的朋友找到更加简单易行的办法。
发展壮大离不开广大客户长期以来的信赖与支持,我们将始终秉承“诚信为本、服务至上”的服务理念,坚持“二合一”的优良服务模式,真诚服务每家企业,认真做好每个细节,不断完善自我,成就企业,实现共赢。行业涉及电动窗帘等,在成都网站建设、成都营销网站建设、WAP手机网站、VI设计、软件开发等项目上具有丰富的设计经验。
在Java项目中將一个对象转换成一段Json格式的字符串是非常常见的,能够实现这种需求的工具包也比较多,例如Gson、JSON-lib、Jackson等等。本文主要介绍Jackson的使用,Jackson除了能实现Java对象与Json串的互转外,还能將Java对象转换为Xml格式,使用较为简单而且据说效率比较高。
对于Jackson的jar包我们可以从maven资源库中下载:http://www.php.cn/
所需jar包如下,按照名称搜索下载即可。
接下来编写测试用例,我们需要一个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(); } }
运行测试方法,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(); } }
由于我们重写了Book类的toString方法,运行测试方法,控制台输出:
name:Think in Java; price:100
3.將Java对象转为Xml格式:
/* * 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(); } }
运行测试方法,控制台输出:
<Book xmlns=""><name>Think in Java</name><price>100</price></Book>
4.將xml格式字符串转为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
完整的测试用例代码:
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格式的字符串是非常常见的,能够实现这种需求的工具包也比较多,例如Gson、JSON-lib、Jackson等等。本文主要介绍Jackson的使用,Jackson除了能实现Java对象与Json串的互转外,还能將Java对象转换为Xml格式,使用较为简单而且据说效率比较高。
对于Jackson的jar包我们可以从maven资源库中下载:http://www.php.cn/
所需jar包如下,按照名称搜索下载即可。
接下来编写测试用例,我们需要一个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(); } }
运行测试方法,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(); } }
由于我们重写了Book类的toString方法,运行测试方法,控制台输出:
name:Think in Java; price:100
3.將Java对象转为Xml格式:
/* * 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(); } }
运行测试方法,控制台输出:
<Book xmlns=""><name>Think in Java</name><price>100</price></Book>
4.將xml格式字符串转为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
完整的测试用例代码:
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(); } } }
以上就是使用Jackson工具对Java对象、Json和Xml进行转换的方法,详细使用情况还需要大家自己亲自动手使用过才能领会。如果想了解更多相关内容,欢迎关注创新互联行业资讯频道!
分享题目:如何使用Jackson工具对Java对象、Json和Xml进行转换
网页链接:https://www.cdcxhl.com/article18/jiepdp.html
成都网站建设公司_创新互联,为您提供网站导航、云服务器、营销型网站建设、定制开发、网站收录、品牌网站设计
声明:本网站发布的内容(图片、视频和文字)以用户投稿、用户转载内容为主,如果涉及侵权请尽快告知,我们将会在第一时间删除。文章观点不代表本网站立场,如需处理请联系客服。电话:028-86922220;邮箱:631063699@qq.com。内容未经允许不得转载,或转载时需注明来源: 创新互联