ZipInputStream读取zip包中的指定文件小案例-java-创新互联

首先新建一些zip包，里面包含几个json文件，如下图所示：

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这里以读取name1.json为例：

maven依赖

com.fasterxml.jackson.corejackson-core2.14.0com.fasterxml.jackson.corejackson-databind2.12.7.1com.fasterxml.jackson.corejackson-annotations2.14.0

json对应的实体类

package com.zhaotq.service.io;

import java.util.Date;

//json对应的实体类
public class TestJsonDemoDto {
    private String message;
    private String condition;
    private String com;
    private String status;
    private String state;
    private String time;

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getCondition() {
        return condition;
    }

    public void setCondition(String condition) {
        this.condition = condition;
    }

    public String getCom() {
        return com;
    }

    public void setCom(String com) {
        this.com = com;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }
    @Override
    public String toString() {
        return "TestJsonDemoDto{" +
                "message='" + message + '\'' +
                ", condition='" + condition + '\'' +
                ", com='" + com + '\'' +
                ", status='" + status + '\'' +
                ", state='" + state + '\'' +
                ", time='" + time + '\'' +
                '}';
    }
}

主方法

package com.zhaotq.service.io;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.util.JSONPObject;
import jdk.nashorn.internal.parser.JSONParser;
import jdk.nashorn.internal.runtime.JSONFunctions;

import java.io.*;
import java.util.HashMap;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

//测试读取zip包内容
public class ZipFileDemo {
    public static void main(String[] args) {

        HashMap hashMap = null;
        try {
            hashMap = ZipFileDemo.readData("/Users/zhaotianqiang/Documents/01-coding/study-spring/src/main/resources/test.zip",".json");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        System.out.println("=======json读取=======");
        String str = (String) hashMap.get("name1");
        System.out.println(str);
        String json = JSONParser.quote(str);//转移符添加，在这里没用
        System.out.println(json);
        ObjectMapper mapper = new ObjectMapper();
        try {
            TestJsonDemoDto testJsonDemoDto = mapper.readValue(str, TestJsonDemoDto.class);
            System.out.println(testJsonDemoDto.toString());
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    // 以某关键字读取某路径下的压缩包的方法，最终返回一个map，map中的每一项是一个文件或者文件夹
    public static HashMap readData(String path,String fileKeyWord) throws IOException {
        //得到输入流
        InputStream inputStream = new FileInputStream(path);
        ZipInputStream zin = new ZipInputStream(inputStream);
        BufferedInputStream bs = new BufferedInputStream(zin);
        byte[] bytes = null;
        ZipEntry ze;
        HashMap jsonMap= new HashMap();
        //循环读取压缩包里面的文件
        int a = 1;
        while ((ze = zin.getNextEntry()) != null) {
            System.out.println("第"+a++ +"层是："+ze.getName());
            System.out.println("是否是目录："+ze.isDirectory());

            StringBuilder orginJson = new StringBuilder();
            if (ze.toString().endsWith(fileKeyWord)) {
                //读取每个文件的字节，并放进数组
                bytes = new byte[(int) ze.getSize()];
                bs.read(bytes, 0, (int) ze.getSize());
                //将文件转成流
                InputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
                BufferedReader br = new BufferedReader(new InputStreamReader(byteArrayInputStream));
                //读取文件里面的内容
                String line;
                while ((line = br.readLine()) != null) {
                    orginJson.append(line);
                }
                //关闭流
                br.close();
                String name=new String(ze.getName().replace(".json",""));
                jsonMap.put(name,orginJson.toString());
            }
        }
        zin.closeEntry();
        inputStream.close();
        return jsonMap;
    }

}

实际运行结果如下：

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