import java.io.File
import java.io.FileInputStream
import java.io.FileNotFoundException
import java.io.FileOutputStream
import java.io.FileWriter
import java.io.IOException
import java.io.InputStream
import java.io.InputStreamReader
/**
* java读写文件
* 读取d:/1.txt文件内容,写入f:/text.txt文件中.
*
* 写入文件换行用fw.write("\r\n")
* 或者fw.write("\n")
* @author young
*
*/
public class FileWriterTest {
// 读写文件
public static void rwFile(){
FileWriter fw = null
BufferedReader br = null
try {
// 定义FileWriter对象，关联文件f:\text.txt，用来向文件写内容
fw = new FileWriter("f:\\text.txt", true)
// 定义bufferedReader对象，用来读取d:\1.txt文件内容
br = new BufferedReader(new InputStreamReader(
new FileInputStream("d:\\1.html"), "UTF-8"))
String line = null
// 每次读取一行内容，循环读取，读到文件末尾结束
while ((line = br.readLine()) != null) {
System.out.println("文件内容: " + line)
fw.write(line)
// 刷新缓冲流，
fw.flush()
}
// 关闭I/O流
br.close()
} catch (FileNotFoundException e) {
e.printStackTrace()
} catch (IOException e) {
e.printStackTrace()
} finally {
if (fw != null) {
try {
fw.close()
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace()
}
}
}
}
public static void main(String[] args) {
rwFile()
}
}
function jsonclick() {var jsonstr = '{"desc":"OK","status":1000,"data":{"wendu":"34","ganmao":"各项气象条件适宜，发生感冒机率较低。但请避免长期处于空调房间中，以防感冒。","forecast":[{"fengxiang":"东风","fengli":"3-4级","high":"高温 35℃","type":"多云","low":"低温 27℃","date":"22日星期一"},{"fengxiang":"东风","fengli":"微风级","high":"高温 34℃","type":"多云","low":"低温 26℃","date":"23日星期二"},{"fengxiang":"东风","fengli":"微风级","high":"高温 35℃","type":"多云","low":"低温 27℃","date":"24日星期三"},{"fengxiang":"东风","fengli":"微风级","high":"高温 34℃","type":"多云","low":"低温 26℃","date":"25日星期四"},{"fengxiang":"东北风","fengli":"3-4级","high":"高温 33℃","type":"阴","low":"低温 25℃","date":"26日星期五"}],"yesterday":{"fl":"3-4级","fx":"北风","high":"高温 33℃","type":"雷阵雨","low":"低温 27℃","date":"21日星期日"},"aqi":"53","city":"常州"}}'
var list = new Function("return" + jsonstr)()
//html代码随便拼凑成需要的格式就行了
var htmlstr = "<ul style='border:1px solid #aaccff height:100px width:600px'> <li> 状态码："
+ list.status + "</li> <li> 日期："
+ list.data.yesterday.date + "</li> <li> 地址："
+ list.data.city + "</li> <li> 预测风向："
+ list.data.forecast[0].fengxiang + "</li> </ul>"
document.getElementById("id").innerHTML = htmlstr
}
HTML5已原生支持json的解析，window.JSON.parse()将json格式字符串转换为json对象，window.JSON.stringify()将json对象转换为json格式字符串。
示例：Html代码
<!DOCTYPE HTML>
<html>
<head>
<title>Window.JSON</title>
<meta charset="gb18030">
</head>
<body>
<button type="button" id="btn1">解析json字符串</button>
<button type="button" id="btn2">json对象转换为json字符串</button>
<div id="res">
</div>
<script language="JavaScript">
<!--
var jsonStr = "{\"total\":100,\"data\":[{\"id\":10001,\"name\":\"scott\"},{\"id\":10002,\"name\":\"tiger\"}]}"
var jsonObj = window.JSON.parse(jsonStr)
document.getElementById("btn1").onclick = function() {
var str = "json字符串解析为json对象<br>"
str += "<span>Total:"+jsonObj.total+"</span><br><span>Data:"
for (var i=0i<jsonObj.data.length i++)
{
str += "id:" + jsonObj.data[i].id + ",name:" + jsonObj.data[i].name+"<br>"
}
str += "</span><br>"
document.querySelector("#res").innerHTML = str
}
document.getElementById("btn2").onclick = function() {
var jsonObj = {total:100,data:[{id:10001,name:"scott"},{id:10002,name:"tiger"}]}
var jsonStr = window.JSON.stringify(jsonObj)
var str = "转为json字符串：<br>" + jsonStr
document.querySelector("#res").innerHTML = str
}
//-->
</script>
</body>
</html>
单击“解析json字符串”按钮，结果：
json字符串解析为json对象
Total:100
Data:id:10001,name:scott
id:10002,name:tiger
单击“json对象转换为json字符串”按钮，结果：
转为json字符串：
{"total":100,"data":[{"id":10001,"name":"scott"},{"id":10002,"name":"tiger"}]}
