系列文章目
Gradle学习之一入门介绍
Gradle学习之二Groovy核心语法
Gradle学习之三Groovy高级语法
Gradle学习之四Gradle生命周期
Gradle学习之五Project详解
Gradle学习之六Task详解
Gradle学习之七其他重要模块
文章目录
一、概述
二、json操作详解
def list = [
new Person(name:'zhangsan',age: 18),
new Person(name:'lisi',age: 18),
new Person(name:'wangwu',age: 18),
new Person(name:'zhaoliu',age: 18),
]
//序列化
def json = JsonOutput.toJson(list)
println(json)
def prettyJson = JsonOutput.prettyPrint(json)
println(prettyJson)
//案例：进行网络请求，并进行数据的反序列化
def respone = getNetworkData('http://api.qingyunke.com/api.php?key=free&appid=0&msg=%E5%8C%97%E4%BA%AC%E5%A4%A9%E6%B0%94')
println respone
//根据Url请求网络
def getNetworkData(String url){
def connection = new URL(url).openConnection()
connection.setRequestMethod('GET')
connection.connect()
def res = connection.content.text
//反序列化
def jsonSlurper = new JsonSlurper()
return jsonSlurper.parseText(res)
}
对XML处理
def xmlData = '''
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="COOKING">
<title lang="en">James Harden</title>
<author>L J</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>L J</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
'''
//序列化
def xmlSlurper = new XmlSlurper()
def bookstore = xmlSlurper.parseText(xmlData)
//打印属性
println bookstore.book[0].title.text()
println bookstore.book[0].title.@lang
//深度优先遍历
def titles = bookstore.depthFirst().findAll {
book->
book.author.text()== 'L J'
}
println titles
def list = []
bookstore.book.each {
book-> if(book.author.text() == 'L J'){
list.add(book.title.text())
} }
println list
//广度遍历查找COOKING类型图书
def result = bookstore.children()
.findAll {
book-> book.@category == 'COOKING'}
.collect( book-> book.title.text())
println result
接下来看一下自定义XML字符串
//创建XML字符串，使用
def stringWriter = new StringWriter()
def mb = new MarkupBuilder(stringWriter)
mb.bookstore(){
//显式指明属性
book(category:'COOKING'){
title(lang:'en','Everyday Italian')
//直接设置标签对应的value
author('Giada De Laurentiis')
year(2005)
price(30.00)
}
book(category:'COOKING'){
title(lang:'en','James Harden')
author('L J')
year(2010)
price(30.00)
}
book(category:'CHILDREN'){
title(lang:'en','Harry Potter')
author('J K. Rowling')
year(2005)
price(29.99)
}
book(category:'WEB'){
title(lang:'en','Learning XML')
author('L J')
year(2003)
price(1.99)
}
}
println stringWriter
运行结果：
<bookstore>
<book category='COOKING'>
<title lang='en'>Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category='COOKING'>
<title lang='en'>James Harden</title>
<author>L J</author>
<year>2010</year>
<price>30.00</price>
</book>
<book category='CHILDREN'>
<title lang='en'>Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category='WEB'>
<title lang='en'>Learning XML</title>
<author>L J</author>
<year>2003</year>
<price>1.99</price>
</book>
</bookstore>
最后看一下，将Bean对象转换为xml：
/**
*声明Bean类
*/
class Bookstore {
def books = [
new Book(category:'COOKING',lang: 'en',titleName: 'Everyday Italian',author:'Giada De Laurentiis',year: 2005,price: 200),
new Book(category:'COOKING',lang: 'ch',titleName: 'James Harden',author:'L J',year: 2005,price: 200),
new Book(category:'CHILDREN',lang: 'en',titleName: 'Harry Potter',author:'JK rowling',year: 2005,price: 200),
new Book(category:'WEB',lang: 'en',titleName: 'Learning XML',author:'L J',year: 2005,price: 200),
]
}
class Book{
String category
String lang
String titleName
String author
Number year
Number price
}
//实例化Bean对象
def bookstore = new Bookstore()
def stringWriter = new StringWriter()
def mb = new MarkupBuilder(stringWriter)
mb.bookstore{
//使用循环+闭包的形式创建xml结点
bookstore.books.each {
book->
Book(category:book.category){
title(lang:book.lang,book.titleName)
author(book.author)
year(book.year)
price("$book.price \$")
}
}
}
println stringWriter
三、文件操作详解
def file = new File('path')
//遍历文件的每一行
file.eachLine{
line ->
println line
}
//获取文件的内容
def text = file.getText()
//获取文件内容 每一行（返回一个数组）
def result = file.readLines()
//读取100个字符
def reader = file.withReader{
reader->
charp[] buff = new char[100]
reader.read(buff)
return buff
}
//文件拷贝
def copy(String sourcePath,String destPath){
try{
//确保目标文件存在
def destFile = new File(destPath)
if(!destFile.exists()){
destFile.createNewFile()
}
//拷贝操作
new File(sourcePath).withReader{
reader->
def lines = reader.readLines()
destFile.withWriter{
writer ->
lines.each{
line ->
writer.append(line+"\r\n")
}
}
}
}catch(Exception e){
e.printStackTrace()
}
}
对象文件读写
def saveObject(Object object,String path){
try{
//确保目标文件存在
def destFile = new File(destPath)
if(!destFile.exists()){
destFile.createNewFile()
}
//写对象
destFile.withObjectOutputStream{
out->
out.writeObject(object)
}
}catch(Exception e){
e.printStackTrace()
}
}
def readObject(String path){
def result = null
try{
//确保目标文件存在
def file = new File(path)
if(file == null || !file.exists()){
return null
}
//写对象
file.withObjectInputStream{
in->
result = in.readObject()
}
}catch(Exception e){
e.printStackTrace()
}
return result;
}
注意：如果IO流对象是new的，则需要显式的调用close方法
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def file = new File('path')
def out = file.newObjectOutputStream()
...
out.close()