1、創建實體類
package com.groovy.model
/**
* 在Groovy不需要自定義構造方法.但是必須要指定屬性名稱去傳參數數據,Groovy會自動創建，在調用的時候會自動生成setter/getter方法
*/
class User implements Serializable{
//用戶Id
Long userId
//用戶名
String userName
//年齡
int age
}
2、創建測試test.txt文件
- 在工程的Resource資源文件夾裏面創建此文件即可在程序讀取，文件內容有自己指定.
A multi-faceted language for the Java platform
Apache Groovy is a powerful, optionally typed and dynamic language, with static-typing and static compilation capabilities,for the Java platform aimed at improving developer productivity thanks to a concise, familiar and easy to learn syntax.
It integrates smoothly with any Java program, and immediately delivers to your application powerful features, includingscripting capabilities, Domain-Specific Language authoring, runtime and compile-time meta-programming and functional programming.
2、測試類
package com.groovy.domain
import com.groovy.model.User
import org.junit.Test
class FileTest {
@Test
void testReader1() {
//直接讀取項目resource目錄的指定文件名稱
def baseDir = FileTest.getClassLoader().getResource("test.txt").getPath()
/**
* 循環讀取每一行進行讀取.
*/
new File(baseDir).eachLine { line, nb ->
println "Line $nb: $line"
}
}
@Test
void testReader2() {
//指定路徑目錄,在指定文件名進行讀取，此時的路徑必須要知道在哪裏
def baseDir = "D:/devsoft/idea-workspace/groovy/out/production/resources/"
/**
* 循環讀取每一行進行讀取.
*/
new File(baseDir, "test.txt").eachLine { line, nb ->
println "Line $nb: $line"
}
}
@Test
void testReader3() {
//直接讀取項目resource目錄的指定文件名稱
def baseDir = FileTest.getClassLoader().getResource("test.txt").getPath()
/**
* 一次性獲取文件所有內容，並指定編碼
*/
def fileText = new File(baseDir).getText("utf-8")
println(fileText)
}
@Test
void testWriter1() {
// 此時會在項目工程的groovy/out/production/resources/目錄先對test.txt文件操作
// 建議指定一個磁盤目錄,然後在指定文件名稱進行寫入,如：testWriter2
def baseDir = FileTest.getClassLoader().getResource("test1.txt").getPath()
/**
* 循環讀取每一行進行讀取.
*/
new File(baseDir).withWriter("utf-8") { writer ->
writer.writeLine 'Hello Groovy'
}
}
@Test
void testWriter2() {
def baseDir = "D:/test/"
/**
* 指定一個磁盤文件目錄，並且指定一個文件test1.txt名稱進行寫入內容
*/
new File(baseDir, "test1.txt").withWriter("utf-8") { writer ->
writer.writeLine 'Hello Groovy'
}
}
/**
* 拷貝文件內容,從一個文件拷貝內容到另外一個文件
* @param sourcePath
* @param dstPath
*/
def copyFile(String sourcePath, String dstPath) {
try {
//判斷不存在就,創建文件目錄
def dstFile = new File(dstPath)
if (!dstFile.exists()) {
dstFile.createNewFile()
}
//開始拷貝
new File(sourcePath).withReader { reader ->
//一次性讀取所有信息
def lines = reader.readLines()
//寫入目標文件
dstFile.withWriter { writer ->
lines.forEach { line ->
//寫入目標文件並且換行
writer.append(line).append("\r\n")
}
}
}
return true
} catch (Exception ex) {
ex.printStackTrace()
}
return false
}
/**
* 保存Object
* @param obj
* @param path
*/
def saveObject(Object obj, String path) {
try {
def dstFile = new File(path)
if (!dstFile.exists()) {
dstFile.createNewFile()
}
dstFile.withObjectOutputStream {
it.writeObject(obj)
}
return true
} catch (Exception ex) {
ex.printStackTrace()
}
return false
}
/**
* 讀取對象數據
* @param path
*/
def readObject(String path) {
def obj = null
try {
def dstFile = new File(path)
if (dstFile == null || !dstFile.exists()) return null
//讀取對象數據出來
dstFile.withObjectInputStream {
obj = it.readObject()
}
} catch (Exception ex) {
ex.printStackTrace()
}
return obj
}
@Test
void testReaderObject() {
//讀取出來並轉換成User對象，語法與Kotlin類似
def user = readObject("user.bin") as User
println("userName=${user.userName},age=${user.age}")
}
@Test
void testWriterObject() {
def result = saveObject(user, "user.bin")
println(result ? "成功" : "失敗")
}
}
3、testReader1與testReader2運行的結果
4、testWriter1與與testWriter2運行的結果
5、testWriterObject運行的結果
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6、testReaderObject運行的結果
userName=周伯通,age=110
