java解析json复杂数据的第三种思路

一、概述

接上篇 java解析json复杂数据的两种思路
我们已经通过解析返回json字符串得到数据,现在改变思路, 按照如下流程获取数据:

接口API获取JSON

JSON转XML

dom4j使用XPath解析xml

二、数据预览

1. 接口json数据

https://blog.csdn.net/community/home-api/v1/get-business-list?page=1&size=5&businessType=blog&username=qq_16127313

{
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2. json转xml数据

<root>
  <code>200code>
  <message>successmessage>
  <traceId>cec7dfb0-78f4-40c4-b1ce-7463b100e3fdtraceId>
  <data>
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      <diggCount>16diggCount>
      <formatTime>前天 14:11formatTime>
      <picList>https://img-blog.csdnimg.cn/direct/a409a0f4555c459fa05c00fd9ee0ea8c.pngpicList>
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    list>
    <list>
      <articleId>135244727articleId>
      <title>java lambda表达式训练题一title>
      <description>Lambda 表达式，也可称为闭包，它是推动 Java 8 发布的最重要新特性。Lambda 允许把函数作为一个方法的参数（函数作为参数传递进方法中）。使用 Lambda 表达式可以使代码变的更加简洁紧凑。description>
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root>

三、代码实现

1. pom.xml

		<dependency>
			<groupId>org.springframeworkgroupId>
			<artifactId>spring-webfluxartifactId>
			<version>5.2.3.RELEASEversion>
		dependency>
		<dependency>
			<groupId>io.projectreactor.nettygroupId>
			<artifactId>reactor-nettyartifactId>
			<version>0.9.4.RELEASEversion>
		dependency>
		<dependency>
			<groupId>org.apache.logging.log4jgroupId>
			<artifactId>log4j-slf4j-implartifactId>
			<version>2.12.1version>
		dependency>
		<dependency>
			<groupId>org.apache.commonsgroupId>
			<artifactId>commons-lang3artifactId>
			<version>3.10version>
		dependency>
		<dependency>
			<groupId>commons-iogroupId>
			<artifactId>commons-ioartifactId>
			<version>2.5version>
		dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.dataformatgroupId>
			<artifactId>jackson-dataformat-xmlartifactId>
			<version>2.10.2version>
		dependency>
		<dependency>
		    <groupId>org.dom4jgroupId>
		    <artifactId>dom4jartifactId>
		    <version>2.1.4version>
		dependency>
		<dependency>
		    <groupId>jaxengroupId>
		    <artifactId>jaxenartifactId>
		    <version>2.0.0version>
		dependency>
		<dependency>
			<groupId>org.junit.jupitergroupId>
			<artifactId>junit-jupiter-apiartifactId>
			<version>5.5.2version>
			<scope>testscope>
		dependency>
		<dependency>
			<groupId>org.projectlombokgroupId>
			<artifactId>lombokartifactId>
			<version>1.18.12version>
			<scope>providedscope>
		dependency>

2. 核心代码

package com.fly.xml;

import java.io.IOException;
import java.io.StringReader;
import java.nio.charset.StandardCharsets;

import org.apache.commons.io.IOUtils;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.http.MediaType;
import org.springframework.web.reactive.function.client.WebClient;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.json.JsonMapper;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class XmlTest
{
    static JsonMapper jsonMapper = new JsonMapper();
    
    static XmlMapper xmlMapper = new XmlMapper();
    
    static WebClient webClient = WebClient.builder().codecs(configurer -> configurer.defaultCodecs().maxInMemorySize(-1)).build(); 
    
   
    @Test
    public void testApi()
        throws IOException, DocumentException
    {
        //WebClient同步调用
        String url = "https://blog.csdn.net/community/home-api/v1/get-business-list?page=1&size=5&businessType=blog&username=qq_16127313";
        String jsonText = webClient.get().uri(url).acceptCharset(StandardCharsets.UTF_8).accept(MediaType.APPLICATION_JSON).retrieve().bodyToMono(String.class).block();
       
        //json转xml
        JsonNode jsonNode = jsonMapper.readTree(jsonText);
        String xml = xmlMapper.writeValueAsString(jsonNode);
        
        // dom4j、XPath
        Document doc = new SAXReader().read(new StringReader(xml));
        doc.selectNodes("//data/list/url").stream().forEach(n -> log.info(n.getStringValue()));
        doc.selectNodes("//data/list/viewCount").stream().forEach(n -> log.info(n.getStringValue()));
    }
}

3. 运行结果

四、源码传送

https://gitee.com/00fly/effict-side/blob/master/springboot-cache/src/test/java/com/fly/test/restful/json/ParseJson.java

---

大家可以根据需要选择方案，有任何问题和建议，都可以向我提问讨论,大家一起进步，谢谢!

-over-