# groovydemo

**Repository Path**: android100/groovydemo

## Basic Information

- **Project Name**: groovydemo
- **Description**: groovy使用http,file等
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-03-20
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README



# 一、groovy 与 properties

```groovy
//
//  参考：
//  https://www.w3cschool.cn/groovy/groovy_file_io.html
//  https://www.cnblogs.com/xudong-bupt/p/3758136.html
//
//
class TestProp {

    public static void main(String[] args) {

        def filename = "src\\file\\one.properties"
        def props = new Properties();
        props.load(new FileInputStream(filename));

        println("===================遍历一=========================")

        Enumeration enumeration = props.keys();
        while (enumeration.hasMoreElements()) {
            def key = enumeration.nextElement();
            def val = props.get(key);
            println "property : " + key + "  =  " + val;
        }

        println("===================遍历二=========================")

        Iterator<String> it = props.stringPropertyNames().iterator();
        while (it.hasNext()) {
            String key = it.next();
            println(key + ":" + props.getProperty(key));
        }

        println("===================获取方式一=========================")

        def name = props["name"]
        def id = props["id"]
        def age = props["age"]
        println("name = $name , id = $id ， age = $age")

        println("===================获取方式二=========================")
        def name2 = props.get("name")
        def id2 = props.get("id")
        def age2 = props.get("age")
        println("name2 = $name2 , id2 = $id2 ， age2 = $age2")

        println("===================获取方式三=========================")
        def name3 = props.getProperty("name")
        def id3 = props.getProperty("id")
        def age3 = props.getProperty("age")
        println("name3 = $name3 , id3 = $id3 ， age3 = $age3")
    }


}

```

# 二、groovy 与 File

```groovy

import groovy.json.JsonSlurper

import java.text.SimpleDateFormat

//  https://www.w3cschool.cn/groovy/groovy_file_io.html
// Groovy读取文件信息
// https://www.cnblogs.com/alansheng/p/4788237.html
class TestFile {

    public static void main(String[] args) {

        println("*****************     读取文件     *********************")

        readFile()


        println("*****************     写入文件     *********************")

        writeFile("src\\file\\two.txt")
        writeFile2("src\\file\\two2.txt")

        println("*****************     复制文件     *********************")

        copyFile()

        println("*****************     操作目录     *********************")

        handleDictionary()
    }

    private static void handleDictionary() {
        def dir = new File("src", "\\file")
        if (dir.isDirectory()) {
            dir.eachFileRecurse { file ->
                println file
            }
        }

        //使正则表达式匹配文件名
        dir.eachFileMatch(~/.*\.txt/) { File it -> println it.name }
    }

    private static void copyFile() {
        //可以写入不同的文件类型，拷贝的只是文件内容
        def src = new File("src", "file\\one.txt")
        def dst = new File("src", "file\\three.txt")
        if (!dst.exists()) {
            dst.createNewFile()
        }
        dst << src.text
    }

    private static void readFile() {
        new File("src", 'file\\one.txt').eachLine { line ->
            println line
        }

        new File("src", 'file\\one.txt').eachLine { line, lineNum ->
            println(lineNum + " " + line)
        }

        //读取文件的内容到字符串
        File file = new File("src", "file\\one.txt")
        println file.text
    }

    def static writeFile(fileName) {
        new File(fileName).withWriter('utf-8') { writer ->
            writer.write('The first content of file')
            writer.write('\n')
            writer.write('The first content of file')
            writer.write('\n')
            writer.write("name : xq")
            writer.write('\n')
            writer.write("time : ${getTime()}")
        }
    }

    def static writeFile2(fileName) {
        def file = new File(fileName)

        if (file.exists())
            file.delete()

        def printWriter = file.newPrintWriter() //

        printWriter.write('The first2 content of file')
        printWriter.write('\n')
        printWriter.write('The first2 content of file')
        printWriter.write('\n')
        printWriter.write("name : xq2")
        printWriter.write('\n')
        printWriter.write("time2 : ${getTime()}")

        printWriter.flush()
        printWriter.close()
    }

    def static getTime() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar calendar = Calendar.getInstance();
        return sdf.format(calendar.getTime());
    }
}

```

# 三、groovy 与 json

one.json:

```json
[
  {
    "id": "1",
    "courseID": "数学",
    "title": "一加一等于几"
  },
  {
    "id": "2",
    "courseID": "语文",
    "title": "请背诵全文"
  }
] 
```
two.json:

```json

{
  "cateid": 53,
  "name": "狗狗玩具",
  "children": [
    {
      "type": "cateid",
      "id": "210",
      "name": "棉制玩具",
      "photo": "http://i.epetbar.com/nowater/cates/2014-03/24/fcab37ead00d77bcdddf7dabe6c817d7.jpg"
    },
    {
      "type": "cateid",
      "id": "211",
      "name": "橡胶玩具",
      "photo": "http://i.epetbar.com/nowater/2016-07/21/14/874299e54a8cf1488d6b1bead8f8e9bb.jpg"
    },
    {
      "type": "cateid",
      "id": "212",
      "name": "塑料玩具",
      "photo": "http://i.epetbar.com/nowater/cates/2014-03/24/df1ed7120376370a4b5badaae61a0a7e.jpg"
    },
    {
      "type": "cateid",
      "id": "213",
      "name": "手工玩具",
      "photo": "http://i.epetbar.com/nowater/cates/2014-03/24/6709410560b999ab37ffb9747bb2ee71.jpg"
    },
    {
      "type": "cateid",
      "id": "3088",
      "name": "食用玩具",
      "photo": "http://i.epetbar.com/nowater/cates/2014-03/24/a5c7619872749790f6d6fd1ff3eccedc.jpg"
    },
    {
      "type": "cateid",
      "id": "4157",
      "name": "木质玩具",
      "photo": "http://i.epetbar.com/nowater/cates/2014-03/24/e9145de044fd5cec4c9b8ed47360d98f.jpg"
    },
    {
      "type": "cateid",
      "id": "4188",
      "name": "梵米派",
      "photo": "http://i.epetbar.com/nowater/cates/2015-07/28/45c339f6acb56364132b92f04b090c5c.jpg"
    }
  ]
}
```

```groovy

import groovy.json.JsonOutput
import groovy.json.JsonSlurper
import org.apache.groovy.json.internal.LazyMap

//  https://www.w3cschool.cn/groovy/groovy_file_io.html
class TestJson {

    public static void main(String[] args) {

        //***************************************************************************
        //***
        //***   JsonSlurper
        //***   {}  :   LazyMap,   空映射 [:]
        //***   []  :   ArrayList, 空集合 []
        //***
        //***************************************************************************
        def jsonSlurper = new JsonSlurper()

        test1(jsonSlurper)
        println()
        println()
        test2(jsonSlurper)
        println()
        println()
        test3(jsonSlurper)
        println()
        println()
        test4(jsonSlurper)
    }

    private static void test1(JsonSlurper jsonSlurper) {
        def object = jsonSlurper.parseText('{ "name": "John", "ID" : "1"}')
        println(object.getClass());
        if (object instanceof LazyMap && object.size() > 0) {
            println(object.name);
            println(object.ID);
        }
    }

    /**
     * 对象转化为JSON
     * 在 Groovy 中提供 JsonOutput 将对象解析为 json 字符串。
     */
    private static void test2(JsonSlurper jsonSlurper) {
        Person person = new Person("xq", 26)
        //将对象生成json
        def json = JsonOutput.toJson(person)
        //JsonOutput.prettyPrint 输出带有 json 格式
        println "0===========================" + json
        println "1===========================" + JsonOutput.prettyPrint(json)

        //解析json为map或list
        def jsonObj = jsonSlurper.parseText(json)
        println "2===========================" + jsonObj.getClass()
        if (jsonObj instanceof Map) {
            println "3===========================" + jsonObj["name"]
        }
    }

    private static void test3(JsonSlurper jsonSlurper) {
        def jsonObj = jsonSlurper.parseText(new File("src", "file\\one.json").text)
        println("=====================================" + jsonObj)
        println("=====================================" + jsonObj.getClass())
        //class java.util.ArrayList
        if (jsonObj instanceof ArrayList && jsonObj.size() > 0) {
            println("=====================================" + jsonObj.size())
            jsonObj.each {
                println("=============================" + it)
                println("=============================" + it.getClass())
                //class org.apache.groovy.json.internal.LazyMap
                if (it instanceof LazyMap && it.size() > 0) {
                    println("=============================" + it.size())
                    it.each { key, value ->
                        println key + "========================" + value
                    }
                }
            }
        }
    }

    private static void test4(JsonSlurper jsonSlurper) {
        def jsonObj = jsonSlurper.parseText(new File("src", "file\\two.json").getText())
        println("00==============================" + jsonObj.getClass())
        //class org.apache.groovy.json.internal.LazyMap

        def children = jsonObj["children"]
        println "20==============================" + children
        println "21==============================" + children.getClass()
        println()
        //class java.util.ArrayList

        def result = children.findAll { item ->
            println "30==============================" + item
            println "31==============================" + item.getClass()
            //class org.apache.groovy.json.internal.LazyMap
            item["id"] == "3088"  //true or false
        }
        println "40==============================" + result
    }
}

class Person implements Serializable {

    private String name
    private int age

    Person(String name, int age) {
        this.name = name
        this.age = age
    }

    String getName() {
        return name
    }

    void setName(String name) {
        this.name = name
    }

    int getAge() {
        return age
    }

    void setAge(int age) {
        this.age = age
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

```