我要评论代码非常简单实用，这里就不多废话了，直接奉上源码
package android.mooc.tools;
import java.io.bufferedinputstream;
import java.io.file;
import java.io.randomaccessfile;
import java.net.url;
import java.net.urlconnection;
import android.util.log;
public class filedownloadthread extends thread {
private static final int buffer_size = 1024;
private url url;
private file file;
private int startposition;
private int endposition;
private int curposition;
// 用于标识当前线程是否下载完成
private boolean finished = false;
private int downloadsize;
private boolean state;
boolean destory;
public boolean isdestory() {
return destory;
}
public void setdestory(boolean destory) {
this.destory = destory;
}
public filedownloadthread(url url, file file, int startposition, int endposition) {
this.url = url;
this.file = file;
this.startposition = startposition;
this.curposition = startposition;
this.endposition = endposition;
this.downloadsize = 0;
}
@override
public void run() {
destory = false;
state = true;
bufferedinputstream bis = null;
randomaccessfile fos = null;
byte[] buf = new byte[buffer_size];
urlconnection con = null;
try {
con = url.openconnection();
con.setallowuserinteraction(true);
// 设置当前线程下载的起点，终点
con.setrequestproperty("range", "bytes=" + startposition + "-" + endposition);
con.setrequestproperty("accept", "*/*");
con.setrequestproperty("connection", "keep-alive");
con.setrequestproperty("accept-language", "zh-cn");
con.setrequestproperty("charset", "utf-8");
con.setrequestproperty("user-agent",
"mozilla/4.0 (compatible; msie 8.0; windows nt 5.2; trident/4.0; .net clr 1.1.4322;"
+ " .net clr 2.0.50727; .net clr 3.0.04506.30; .net clr 3.0.4506.2152; .net clr 3.5.30729)");
// 使用java中的randomaccessfile 对文件进行随机读写操作
fos = new randomaccessfile(file, "rw");
// 设置开始写文件的位置
fos.seek(startposition);
bis = new bufferedinputstream(con.getinputstream());
// 开始循环以流的形式读写文件
while ((curposition < endposition) && (!destory)) {
while (state == false) {
sleep(2000);
}
int len = bis.read(buf, 0, buffer_size);
if (len != -1) {
fos.write(buf, 0, len);
curposition = curposition + len;
if (curposition > endposition) {
downloadsize += len - (curposition - endposition);
} else {
downloadsize += len;
}
}
log.i("333", "run" + " len=" + len);
}
// 下载完成设为true
this.finished = true;
bis.close();
fos.close();
} catch (exception e) {
e.printstacktrace();
}
}
public boolean isstate() {
return state;
}
public void setstate(boolean state) {
this.state = state;
}
public boolean isfinished() {
return finished;
}
public int getdownloadsize() {
return downloadsize;
}
public void setdownloadsize(int downloadsize) {
this.downloadsize = downloadsize;
}
}
以上所述就是本文的全部内容了，希望大家能够喜欢。
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