outputstreamwriter
一、是否有无追加模式(是否从已有文件末尾追加)
printwriter:无
BufferedWriter:有
二、是否能能控制编码
outputstreamWriter:能
PrintWriter:能
BufferedWriter:不能
三、是否能控制封包大小
OutputStreamWriter:不能
PrintWriter:不能
BufferedWriter:能
四、封装的是Writer(是字符数据)还是数据流(是二进制数据)
OutputStreamWriter:数据流
PrintWriter:数据流
BufferedWriter:writer
代码示例:
OutputStreamWriter osw=null;
PrintWriter pw=null;
BufferedWriter bw=null;
try{
osw=new OutputStreamWriter(new FileOutputStream("d:/write1.txt",false),"GBK");
pw=new PrintWriter("d:/write1.txt","GBK");
bw=new BufferedWriter(new FileWriter("d:/write1.txt",false));
String str="9. 分别使用OutputStreamWriter、PrintWriter和BufferedWriter";
String str2="类将三行字符串写入到文本文件中,";
String str3="仔细分析有何差别";
String str4="youedkdkdkdkdlkaldalelrladl";
String str5="youedkdkdkdkdlkaldalelrladl";
String str6="youedkdkdkdkdlkaldalelrladl";
String str7="ssssssssssssssssssdtfwserewdd";
String str8="ssssssssssssssssssdtfwserewdd";
String str9="ssssssssssssssssssdtfwserewdd";
pw.println(str);
pw.println(str2);
pw.println(str3);
pw.flush();
pw.close();
osw.write(str4+"\r\n");
osw.write(str5+"\r\n");
osw.write(str6+"\r\n");
osw.close();
bw.write(str7);
bw.newLine();
bw.write(str8);
bw.newLine();
bw.write(str9);
bw.flush();
bw.close();
}
catch(UnsupportedEncodingException e){
e.printstacktrace();
}
catch(IOException e){
e.printStackTrace();
}
java POST请求远程HTTP接口
package com.oemp.common;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.inputstreamreader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* @author Post Method
*/
public class HttpPostUrl {
/**
* 向指定URL发送POST请求
* @param url
* @param paramMap
* @return 响应结果
*/
public static String sendPost(String url, Map<String, String> paramMap) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setrequestproperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent","Mozilla/4.0 (compatible; MSIE 6.0; windows NT 5.1;SV1)");
// conn.setRequestProperty("Charset", "UTF-8");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 设置请求属性
String param = "";
if (paramMap != null && paramMap.size() > 0) {
Iterator<String> ite = paramMap.keySet().iterator();
while (ite.hasNext()) {
String key = ite.next();// key
String value = paramMap.get(key);
param += key + "=" + value + "&";
}
param = param.substring(0, param.length() - 1);
}
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.err.println("发送 POST 请求出现异常!" + e);
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
/**
* 数据流post请求
* @param urlStr
* @param xmlInfo
*/
public static String doPost(String urlStr, String strInfo) {
String reStr="";
try {
URL url = new URL(urlStr);
URLConnection con = url.openConnection();
con.setDoOutput(true);
con.setRequestProperty("pragma:", "no-cache");
con.setRequestProperty("Cache-Control", "no-cache");
con.setRequestProperty("content-Type", "text/xml");
OutputStreamWriter out = new OutputStreamWriter(con.getOutputStream());
out.write(new String(strInfo.getBytes("utf-8")));
out.flush();
out.close();
BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream(), "utf-8"));
String line = "";
for (line = br.readLine(); line != null; line = br.readLine()) {
reStr += line;
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return reStr;
}
/**
* 测试主方法
* @param args
*/
public static void main(String[] args) {
Map<String, String> mAPParam = new HashMap<String, String>();
mapParam.put("name", "张三");
mapParam.put("validation","test");
String pathUrl = "http://localhost/testPost.action";
String result = sendPost(pathUrl, mapParam);
System.out.println(result);
}
}
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