【转】java.lang.StackOverflowError

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出现一个java.lang.StackOverflowError异常。弄了半天，又是问高手，又是查资料的。最后发现，解决问题啦！特记录下来！

StackOverflowError是由于当前线程的栈满了 ，也就是函数调用层级过多导致。

比如死递归。

以上是网上查阅的资料。

看懂后，我发现我的项目用的servlet技术，讲doGet()方法添加方法this.doPost()得到解决。

思考：应该是我在实现分页的时候，在点击上一页，下一页时，调用servlet函数后再调回本页面是，出现循环。

result.jsp

[html] view plaincopy

<%

int pageNow = Integer.parseInt((String) request

.getAttribute("pageNow"));

if (pageNow != 1) {

out.println("<a href=Db_sel_Servlet?dbversion=Mysql&pageNow="

+ (pageNow - 1) + ">上一页</a>");

}

String s_pageCount = (String) request.getAttribute("pageCount");

int pageCount = Integer.parseInt(s_pageCount);

for (int i = 1; i <= pageCount; i++) {

out.println("<a href=Db_sel_Servlet?dbversion=Mysql&pageNow=" + i

+ ">[" + i + "]</a>");

}

if (pageNow != pageCount) {

out.println("<a href=Db_sel_Servlet?dbversion=Mysql&pageNow="

+ (pageNow + 1) + ">下一页</a>");

}

%>

Db_sel_Servlet.java

[java] view plaincopy

public class Db_sel_Servlet extends HttpServlet {

public String flag;

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

this.doPost(req, resp);

}

public void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

try {

String s_pageNow=req.getParameter("pageNow");

int pageNow=Integer.parseInt(s_pageNow);

System.out.println("DB_sel_Servlet.java---->>>pageNow:"+pageNow);

flag = req.getParameter("dbversion");

System.out.println("DB_sel_Servlet---->>" + flag);

File file = new File("D:\\workspace\\version");

FileUtil.WriteFile(file, flag);

UserDaoImpl userDaoImpl = new UserDaoImpl();

List<User> user_list = userDaoImpl.getUsersByPage(pageNow);

int pageCount=userDaoImpl.getPageCount();

System.out.println("DB_sel_Servlet.java---->>>pageCount:"+pageCount);

req.setAttribute("result", user_list);

req.setAttribute("pageCount", pageCount+"");

req.setAttribute("pageNow",pageNow+"");

System.out.println(user_list);

// 清空文件内的内容

FileUtil.EmptyFile(file);

// 跳转到用户管理页面

req.getRequestDispatcher("result.jsp").forward(req, resp);

} catch (Exception e) {

e.printStackTrace();

}

}