1､解包代码
package cn.l2u.tools.unweapp;
public class WxapkgItem {
private String name;
private int start;
private int length;
public WxapkgItem(String name, int start, int length) {
this.name = name;
this.start = start;
this.length = length;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getStart() {
return start;
}
public void setStart(int start) {
this.start = start;
}
public int getLength() {
return length;
}
public void setLength(int length) {
this.length = length;
}
@Override
public String toString() {
return "WxapkgItem{" +
"name='" + name + '\'' +
", start=" + start +
", length=" + length +
'}';
}
}
package cn.l2u.tools.unweapp;
import java.io.*;
import java.util.ArrayList;
public class Unweapp {
public static void main(String[] args) throws IOException {
if (args.length == 0) {
System.out.println("用法:\nunweapp 输入文件 [输出文件夹]");
} else {
File in = new File(args[0]);
File outDir = args.length == 2 ? outDir = new File(args[1]) : new File(in.getAbsolutePath()+"_unpacked");
run(in, outDir);
}
}
private static void run(File in, File outDir) throws IOException {
RandomAccessFile r = new RandomAccessFile(in, "r");
try {
if (r.readByte() != (byte) 0xBE) {
throw new RuntimeException("文件类型错误");
}
r.seek(0xE);//前面几个字节不知道含义，估计是校验码之类的；不影响解包
int fileCount = r.readInt();//文件数量
ArrayList<WxapkgItem> wxapkgItems = new ArrayList<WxapkgItem>(fileCount);
for (int i = 0; i < fileCount; i++) {
int nameLen = r.readInt();//文件名长度
byte[] buf = new byte[nameLen];
r.read(buf, 0, nameLen);//文件名
String name = new String(buf, 0, nameLen);
int start = r.readInt();//文件内容起始位置
int length = r.readInt();//文件内容长度
wxapkgItems.add(new WxapkgItem(name, start, length));
}
for (WxapkgItem wxapkgItem : wxapkgItems) {
File outFile = new File(outDir, wxapkgItem.getName());
System.out.println(wxapkgItem);
r.seek(wxapkgItem.getStart());
byte[] buf = new byte[wxapkgItem.getLength()];
r.read(buf, 0, wxapkgItem.getLength());
write(outFile,buf);
}
} finally {
r.close();
}
System.out.println("ok");
}
private static void write(File outFile,byte[] buf) throws IOException {
if (!outFile.getParentFile().exists() && !outFile.getParentFile().mkdirs()) {
throw new RuntimeException("无法创建文件夹:" + outFile.getParentFile().getAbsolutePath());
}
FileOutputStream out = new FileOutputStream(outFile);
try{
out.write(buf);
}finally {
out.close();
}
}
}
源码地址：https://github.com/moqi2011/unweapp
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