JAVA/Android(安卓)读写文件，避免中文乱码 FileWriter乱码

关键词：java android 乱码中文读写文件

Java FileWriter中文乱码

原文：http://www.malcolmhardie.com/weblogs/angus/2004/10/23/java-filewriter-xml-and-utf-8/

Java FileWriter 默认是用（ISO-8859-1 or US-ASCII）西方编码的，总之不是UTF-8的，而FileWriter类有getEncoding方法，却没有setEncoding的方法，如下的写法可以使正确输出UTF-8的文件：
OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(path),"UTF-8");
或者
Writer out = new BufferedWriter( new OutputStreamWriter(new FileOutputStream(this.outputFilename),”UTF-8″));

--------------------------------------------------

最近在做HTML静态生成，需要从硬盘上把模版文件的内容读出来。然后，替换相关标签写到指定的文件中。无论是读写，都遇到了中文乱码问题。试过多种方法，发现下面一种可以避免中文乱码。（无论读取还是写入一定要进行编码转换。）

1、JAVA读取文件，避免中文乱码。

/**
* 读取文件内容
*
* @param filePathAndName
* String 如 c:\\1.txt 绝对路径
* @return boolean
*/
public static String readFile(String filePathAndName) {
String fileContent = "";
try {
File f = new File(filePathAndName);
if(f.isFile()&&f.exists()){
InputStreamReader read = new InputStreamReader(new FileInputStream(f),"UTF-8");
BufferedReader reader=new BufferedReader(read);
String line;
while ((line = reader.readLine()) != null) {
fileContent += line;
}
read.close();
}
} catch (Exception e) {
System.out.println("读取文件内容操作出错");
e.printStackTrace();
}
return fileContent;
}

2、JAVA写入文件，避免中文乱码。

public static void writeFile(String filePathAndName, String fileContent) {
try {
File f = new File(filePathAndName);
if (!f.exists()) {
f.createNewFile();
}
OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(f),"UTF-8");
BufferedWriter writer=new BufferedWriter(write);
//PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(filePathAndName)));
//PrintWriter writer = new PrintWriter(new FileWriter(filePathAndName));
writer.write(fileContent);
writer.close();
} catch (Exception e) {
System.out.println("写文件内容操作出错");
e.printStackTrace();
}
}

我试过写入的时候用

1、PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(filePathAndName)));

2、PrintWriter writer = new PrintWriter(new FileWriter(filePathAndName));

都不行。

以上代码经过运行可以避免中文乱码，关键是要编码转换。

---------------------------------------------------------------------------------

Xml—dom4j解析以及写入xml文档时的乱码问题

book.xml

<?xml version="1.0" encoding="UTF-8"?>

<书架>
<书>
<书名>Java就业基础教程</书名>
<作者>张孝祥</作者>
<售价>48元</售价>
<售价>58元</售价>
</书>
<书>
<书名>JavaScript网页开发</书名>
<作者>黎活明</作者>
<售价>46元</售价>
</书>
</书架>

Dom4j.java

package yyy.dom4j;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.Node;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.junit.Test;

public class Dom4j {

private File file = new File("src/book.xml");
//遍历xml文档
@Test
public void testList() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(file);
Element root = document.getRootElement();
list(root);
}
public void list(Element element){
System.out.println(element.getName());
List<Node> nodes = element.elements();
//System.out.println(nodes.size());
for(Node node : nodes){
if(node instanceof Element){
list((Element) node);
}
}
}

//读取某个节点的值
@Test
public void read() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(file);
Element root = document.getRootElement();
Element price = root.element("书").element("作者");
String value = price.getText();
System.out.println(value);
}

//添加某个节点
@Test
public void add() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(file);

Element price = DocumentHelper.createElement("售价"); //创建新的节点
price.setText("44元"); //设置节点值

Element root = document.getRootElement();
root.element("书").add(price); //添加节点

//将内存中的document对象重新写入xml文档特别要注意乱码问题

//方法1：使用OutputStreamWriter设置写入文档时所使用的编码表
OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(file),"utf-8");
document.write(out);
out.close();

/*//方法2：
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("gb2312");
XMLWriter writer = new XMLWriter(new FileWriter(file),format);
writer.write(document);
writer.close();*/

/*//方法3：
OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter writer = new XMLWriter(new OutputStreamWriter(new FileOutputStream(file),"utf-8"),format);
writer.write(document);
writer.close();*/

/*//方法4：
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("gb2312"); //源文档用"gb2312"编码，既不改变源文档的编码格式，又不能有乱码
XMLWriter writer = new XMLWriter(new FileOutputStream(file),format);
writer.write(document);
writer.close();*/

/*//document对象在内存中是以"UTF-8"编码形式存在，用FileWriter将document对象以字符流的形式写入xml文档默认是用本地码表"gb2312"编码
* 乱码问题总结：
* 1.用字符流向文件写入数据要考虑乱码问题，而用字节流就不必考虑乱码问题
* 用字符流向文件写入数据默认使用本地码表即"gb2312"
* 2.任何对象读入内存都是以"UTF-8"编码的形式存在
* 默认情况下XMLWriter的write方法是以"UTF-8"的编码形式将内存中的document对象传给FileWriter，所以要想不发生乱码问题，
* 就要使用包装流OutputStreamWriter并给定写入文件时所使用的编码表，或者使用OutputFormat的setEncoding方法指定传给
* 流对象时所使用的编码格式。
* */
}

//向指定位置添加节点
@Test
public void add2() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(file);
Element root = document.getRootElement();
Element price = DocumentHelper.createElement("售价");
price.setText("48元");
List list = root.element("书").elements();
list.add(2,price);

OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter writer = new XMLWriter(new FileOutputStream(file),format);
writer.write(document);
writer.close();
}

//删除某个节点
@Test
public void delete() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(file);
Element root = document.getRootElement();
Element price = root.element("书").element("售价");
price.getParent().remove(price);

OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter writer = new XMLWriter(new FileOutputStream(file),format);
writer.write(document);
writer.close();
}

//更改某个节点的内容
@Test
public void update() throws Exception{
SAXReader reader = new SAXReader();
Document document = reader.read(file);
Element root = document.getRootElement();
Element price = root.element("书").element("售价");
price.setText("58元");

OutputFormat format = OutputFormat.createPrettyPrint();
XMLWriter writer = new XMLWriter(new FileOutputStream(file),format);
writer.write(document);
writer.close();
}
}

Java FileWriter中文乱码

更多相关文章

随机推荐