java class文件准确的反编译思路
推荐两款工具 结合使用1、Java Decompiler这款反编译器叫 “Java Decompiler”, 由 Pavel Kouznetsov开发，目前最新版本为0.2.5. 它由 C++开发，并且官方可以下载 windows、linux和苹果Mac Os三个平台的可执行程序。官方网站：http://jd.benow.ca/ 2、Java 反编译器 JD-GUI ...
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推荐两款工具 结合使用
1、Java Decompiler
这款反编译器叫 “Java Decompiler”, 由 Pavel Kouznetsov开发，目前最新版本为0.2.5. 它由 C++开发，并且官方可以下载 windows、linux和苹果Mac Os三个平台的可执行程序。
官方网站：http://jd.benow.ca/
2、Java 反编译器 JD-GUI
JD-GUI 是一个用 C++ 开发的 Java 反编译工具，由 Pavel Kouznetsov开发，支持Windows、Linux和苹果Mac Os三个平台。而且提供了Eclipse平台下的插件JD-Eclipse。JD-GUI不需要安装，直接点击运行，可以反编译jar,class文件。
官方网站：http://jd.benow.ca/
JD-GUI
主要使用 JD-gui, 因为他可以编译整个文件夹class文件非常方便
但是会偶尔地方报错，需要自己分析代码，比如创建一些 没有必要的局部变量
出错实例如下
public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object h)
throws Exception
{
String servletPath = req.getServletPath().toLowerCase();
boolean isContains = (servletPath.contains("add")) || (servletPath.contains("create"));
boolean pass;
if (isContains) {
String name = this.userService.getStaffNameByStaffId((Long)req.getAttribute("sid"));
boolean pass;
if (StringUtils.isNotBlank(name)) {
pass = true;
} else {
boolean pass = false;
JSON.writeDataToStream(res.getOutputStream(), I18NResult.failure(ErrorType.USERNAM_NONE));
}
} else {
pass = true;
}
return pass;
}
}
pass 多处创建 调整后如下
public boolean preHandle(HttpServletRequest req, HttpServletResponse res, Object h)
/* */ throws Exception
/* */ {
/* 24 */ String servletPath = req.getServletPath().toLowerCase();
/* 25 */ boolean isContains = (servletPath.contains("add")) || (servletPath.contains("create"));
/* */ boolean pass;
/* 26 */ if (isContains) {
/* 27 */ String name = this.userService.getStaffNameByStaffId((Long)req.getAttribute("sid"));
/* 28 */ if (StringUtils.isNotBlank(name)) {
/* 29 */ pass = true;
/* */ } else {
/* 31 */ pass = false;
/* 32 */ JSON.writeDataToStream(res.getOutputStream(), I18NResult.failure(ErrorType.USERNAM_NONE));
/* */ }
/* */ } else {
/* 35 */ pass = true;
/* */ }
/* */
/* 38 */ return pass;
/* */ }
/* */ }
有时候JD-GUI编译出来的代码莫名其妙，这个时候可以结合
Java Decompiler 编译后的代码综合分析
下面给出一个class 文件的一个函数
由 jd-gui编译的函数 （有问题）
@RequestMapping({"/getMyProjectTaskList", "/getMeProjectTasks"})
/* */ @ResponseBody
/* */ public Output getMetasks(@RequestParam("projectId") Long projectId, @Sid Long sid) {
/* */ try {
/* 141 */ metasks = this.taskService.getMetasks(projectId, sid);
/* */ }
/* */ catch (Exception e)
/* */ {
/* */ List metasks;
/* 143 */ throw new RuntimeException(e);
/* */ }
/* 147 */ List metasks;
/* 146 */ List metaskRess = new ArrayList(metasks.size());
/* 147 */ for (Iterator localIterator = metasks.iterator(); localIterator.hasNext(); ) { metask = (MetaskBo)localIterator.next();
/* 148 */ MetaskRes metaskVo = new MetaskRes();
/* */
/* 150 */ metaskVo.setTaskId(ObjectUtils.toString(metask.getTaskId()));
/* 151 */ metaskVo.setIsLeafTask(ObjectUtils.toString(metask.getIsLeafTask()));
/* 152 */ metaskVo.setTaskName(ObjectUtils.toString(metask.getTaskName()));
/* 153 */ srt = metask.getStartDateTime();
/* 154 */ Date end = metask.getEndDateTime();
/* 155 */ metaskVo.setSrtDate(DateUtil.defaultDateToString(srt));
/* 156 */ metaskVo.setEndDate(DateUtil.defaultDateToString(end));
/* 157 */ metaskVo.setIsFinished(ObjectUtils.toString(metask.getIsFinished()));
/* 158 */ metaskVo.setBetween((srt.getTime() <= metask.getCurrentDateTime().longValue()) && (metask.getCurrentDateTime().longValue() <= end.getTime()) ? "1" : "0");
/* 159 */ metaskVo.setTaskDesStatus(ObjectUtils.toString(metask.getTaskDesStatus()));
/* 160 */ metaskVo.setTaskStatus(ObjectUtils.toString(metask.getTaskStatus()));
/* 161 */ metaskVo.setRemindTime(ObjectUtils.toString(metask.getRemindTime()));
/* 162 */ metaskVo.setWatcherSid(ObjectUtils.toString(metask.getWatcherSid()));
/* 163 */ metaskVo.setAuditorSid(ObjectUtils.toString(metask.getAuditorSid()));
/* */
/* 165 */ metaskRess.add(metaskVo);
/* */ }
/* 169 */ Date srt;
/* 168 */ List taskInfos = this.taskProgressService.calcTaskProgress(projectId);
/* 169 */ for (MetaskBo metask = taskInfos.iterator(); metask.hasNext(); ) { taskInfo = (TaskInfo)metask.next();
/* 170 */ for (MetaskRes metaskRes : metaskRess)
/* 171 */ if (taskInfo.getTaskId().toString().equals(metaskRes.getTaskId())) {
/* 172 */ metaskRes.setPlanProgress(ObjectUtils.toString(Float.valueOf(taskInfo.getPlanProgress())));
/* 173 */ float undoneProgress = taskInfo.getPlanProgress() - taskInfo.getProgress();
/* 174 */ metaskRes.setUndoneProgress(ObjectUtils.toString(Float.valueOf(undoneProgress < 0.0F ? 0.0F : undoneProgress)));
/* 175 */ metaskRes.setActualProgress(ObjectUtils.toString(Float.valueOf(taskInfo.getProgress())));
/* 176 */ break;
/* */ }
/* */ }
/* */ TaskInfo taskInfo;
/* 181 */ return Result.success(metaskRess);
/* */ }
由
dj java Decompiler工具分析出来的结果(也有问题)
@RequestMapping(value={"/getMyProjectTaskList", "/getMeProjectTasks"})
@ResponseBody
public Output getMetasks(@RequestParam(value="projectId") Long projectId, @Sid Long sid)
{
List metasks;
try
{
metasks = taskService.getMetasks(projectId, sid);
}
catch(Exception e)
{
throw new RuntimeException(e);
}
List metaskRess = new ArrayList(metasks.size());
MetaskRes metaskVo;
for(Iterator iterator = metasks.iterator(); iterator.hasNext(); metaskRess.add(metaskVo))
{
MetaskBo metask = (MetaskBo)iterator.next();
metaskVo = new MetaskRes();
metaskVo.setTaskId(ObjectUtils.toString(metask.getTaskId()));
metaskVo.setIsLeafTask(ObjectUtils.toString(metask.getIsLeafTask()));
metaskVo.setTaskName(ObjectUtils.toString(metask.getTaskName()));
Date srt = metask.getStartDateTime();
Date end = metask.getEndDateTime();
metaskVo.setSrtDate(DateUtil.defaultDateToString(srt));
metaskVo.setEndDate(DateUtil.defaultDateToString(end));
metaskVo.setIsFinished(ObjectUtils.toString(metask.getIsFinished()));
metaskVo.setBetween(srt.getTime() > metask.getCurrentDateTime().longValue() || metask.getCurrentDateTime().longValue() > end.getTime() ? "0" : "1");
metaskVo.setTaskDesStatus(ObjectUtils.toString(metask.getTaskDesStatus()));
metaskVo.setTaskStatus(ObjectUtils.toString(metask.getTaskStatus()));
metaskVo.setRemindTime(ObjectUtils.toString(metask.getRemindTime()));
metaskVo.setWatcherSid(ObjectUtils.toString(metask.getWatcherSid()));
metaskVo.setAuditorSid(ObjectUtils.toString(metask.getAuditorSid()));
}
List taskInfos = taskProgressService.calcTaskProgress(projectId);
Iterator iterator1 = taskInfos.iterator();
label0:
do
{
if(!iterator1.hasNext())
break;
TaskInfo taskInfo = (TaskInfo)iterator1.next();
Iterator iterator2 = metaskRess.iterator();
MetaskRes metaskRes;
do
{
if(!iterator2.hasNext())
continue label0;
metaskRes = (MetaskRes)iterator2.next();
} while(!taskInfo.getTaskId().toString().equals(metaskRes.getTaskId()));
metaskRes.setPlanProgress(ObjectUtils.toString(Float.valueOf(taskInfo.getPlanProgress())));
float undoneProgress = taskInfo.getPlanProgress() - taskInfo.getProgress();
metaskRes.setUndoneProgress(ObjectUtils.toString(Float.valueOf(undoneProgress >= 0.0F ? undoneProgress : 0.0F)));
metaskRes.setActualProgress(ObjectUtils.toString(Float.valueOf(taskInfo.getProgress())));
} while(true);
return Result.success(metaskRess);
}
结合二者的优点 回避各自缺点
最终分析出来的结果
/* */ @RequestMapping({"/getMyProjectTaskList", "/getMeProjectTasks"})
/* */ @ResponseBody
/* */ public Output getMetasks(@RequestParam("projectId") Long projectId, @Sid Long sid) {
List<MetaskBo> metasks;
/* */ try {
/* 141 */ metasks = this.taskService.getMetasks(projectId, sid);
/* */ }
/* */ catch (Exception e)
/* */ {
/* 143 */ throw new RuntimeException(e);
/* */ }
/* 147 */
/* 146 */ List<MetaskRes> metaskRess = new ArrayList<MetaskRes>(metasks.size());
/* 147 */ for (Iterator localIterator = metasks.iterator(); localIterator.hasNext(); )
{
MetaskBo metask = (MetaskBo)localIterator.next();
/* 148 */ MetaskRes metaskVo = new MetaskRes();
/* */
/* 150 */ metaskVo.setTaskId(ObjectUtils.toString(metask.getTaskId()));
/* 151 */ metaskVo.setIsLeafTask(ObjectUtils.toString(metask.getIsLeafTask()));
/* 152 */ metaskVo.setTaskName(ObjectUtils.toString(metask.getTaskName()));
/* 153 */ Date srt = metask.getStartDateTime();
/* 154 */ Date end = metask.getEndDateTime();
/* 155 */ metaskVo.setSrtDate(DateUtil.defaultDateToString(srt));
/* 156 */ metaskVo.setEndDate(DateUtil.defaultDateToString(end));
/* 157 */ metaskVo.setIsFinished(ObjectUtils.toString(metask.getIsFinished()));
/* 158 */ metaskVo.setBetween((srt.getTime() <= metask.getCurrentDateTime().longValue()) && (metask.getCurrentDateTime().longValue() <= end.getTime()) ? "1" : "0");
/* 159 */ metaskVo.setTaskDesStatus(ObjectUtils.toString(metask.getTaskDesStatus()));
/* 160 */ metaskVo.setTaskStatus(ObjectUtils.toString(metask.getTaskStatus()));
/* 161 */ metaskVo.setRemindTime(ObjectUtils.toString(metask.getRemindTime()));
/* 162 */ metaskVo.setWatcherSid(ObjectUtils.toString(metask.getWatcherSid()));
/* 163 */ metaskVo.setAuditorSid(ObjectUtils.toString(metask.getAuditorSid()));
/* */
/* 165 */ metaskRess.add(metaskVo);
/* */ }
/* 168 */ List<TaskInfo> taskInfos = this.taskProgressService.calcTaskProgress(projectId);
/* 169 */ for (Iterator iterator1= taskInfos.iterator(); iterator1.hasNext(); ) {
TaskInfo taskInfo = (TaskInfo)iterator1.next();
/* 170 */ for (MetaskRes metaskRes : metaskRess)
/* 171 */ if (taskInfo.getTaskId().toString().equals(metaskRes.getTaskId())) {
/* 172 */ metaskRes.setPlanProgress(ObjectUtils.toString(Float.valueOf(taskInfo.getPlanProgress())));
/* 173 */ float undoneProgress = taskInfo.getPlanProgress() - taskInfo.getProgress();
/* 174 */ metaskRes.setUndoneProgress(ObjectUtils.toString(Float.valueOf(undoneProgress < 0.0F ? 0.0F : undoneProgress)));
/* 175 */ metaskRes.setActualProgress(ObjectUtils.toString(Float.valueOf(taskInfo.getProgress())));
/* 176 */ break;
/* */ }
/* */ }
/* 181 */ return Result.success(metaskRess);
/* */ }
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