java：哪里能看到JDK的源代碼？

你安裝JDK的目錄下，有個src.zip文件，這個就是JDK源代碼的java文件。

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你可以解壓來查看，但，最好是關聯到IDE如?eclipse?中（不需解壓），然后?CTRL?+?點擊就可以查看到源代碼了。

如下圖：

java 實現在線書店基本功能的實現

記得SPRING2.0技術手冊里有該項目開發(fā)示例

你搜索一下SPRING

2.0技術手冊

CD光盤

或者

源碼

某網上書城可以查詢、刪除書籍，現要求使用JSP實現該功能

簡單的增刪改查功能

package?EBookDao;

import?java.sql.Connection;

import?java.sql.PreparedStatement;

import?java.sql.ResultSet;

import?java.sql.SQLException;

import?java.util.ArrayList;

import?java.util.List;

import?DBUtil.DBUtil;

import?DBUtil.EBook;

/*

*查詢書集信息

*?

*?*/

public?class?EBookCZ?{

public?ListEBook?find()?{

Connection?conn?=?null;

PreparedStatement?ps?=?null;

ResultSet?rs?=?null;

ListEBook?list?=?new?ArrayListEBook();

try?{

conn?=?DBUtil.getConnection();

String?sql?=?"SELECT?*?FROM?ebook";

ps?=?conn.prepareStatement(sql);

rs?=?ps.executeQuery();

while?(rs.next())?{

EBook?eBook?=?new?EBook();

eBook.setId(rs.getInt("ID"));

eBook.setBname(rs.getString("bname"));

eBook.setPrice(rs.getString("price"));

list.add(eBook);

System.out.println(rs.getInt("ID")+rs.getString("bname")+rs.getString("price"));

}

}?catch?(SQLException?sqle)?{

sqle.printStackTrace();

}?finally?{

DBUtil.close(conn,?ps,?rs);

}

return?list;

}

/*

?*通過id刪除書集信息

?*?

?*?*/

public?static?EBook?DelById(int?id)?{

Connection?conn?=?null;

PreparedStatement?ps?=?null;

ResultSet?rs?=?null;

EBook?book?=?null;

try?{

conn?=?DBUtil.getConnection();

String?sql?=?"delete?ebook?";

sql?+=?"WHERE?ID=??";

ps?=?conn.prepareStatement(sql);

ps.setInt(1,?id);

rs?=?ps.executeQuery();

if?(rs.next())?{

book?=?new?EBook();

book.setId(rs.getInt("ID"));

book.setBname(rs.getString("bname"));

book.setPrice(rs.getString("price"));

}

}?catch?(SQLException?sqle)?{

sqle.printStackTrace();

}?finally?{

DBUtil.close(conn,?ps,?rs);

}

return?book;

}

}

package?EBookServlet;

import?java.io.IOException;

import?java.io.PrintWriter;

import?java.util.List;

import?javax.servlet.ServletException;

import?javax.servlet.http.HttpServlet;

import?javax.servlet.http.HttpServletRequest;

import?javax.servlet.http.HttpServletResponse;

import?DBUtil.EBook;

import?EBookDao.EBookCZ;

public?class?EBookServlet?extends?HttpServlet?{

/**

?*?

?*/

private?static?final?long?serialVersionUID?=?1L;

/**

?*?Constructor?of?the?object.

?*/

public?EBookServlet()?{

super();

}

/**

?*?Destruction?of?the?servlet.?br

?*/

public?void?destroy()?{

super.destroy();?//?Just?puts?"destroy"?string?in?log

//?Put?your?code?here

}

/**

?*?The?doGet?method?of?the?servlet.?br

?*?

?*?This?method?is?called?when?a?form?has?its?tag?value?method?equals?to?get.

?*?

?*?@param?request

?*????????????the?request?send?by?the?client?to?the?server

?*?@param?response

?*????????????the?response?send?by?the?server?to?the?client

?*?@throws?ServletException

?*?????????????if?an?error?occurred

?*?@throws?IOException

?*?????????????if?an?error?occurred

?*/

public?void?doGet(HttpServletRequest?request,?HttpServletResponse?response)

throws?ServletException,?IOException?{

this.doPost(request,?response);

}

/**

?*?The?doPost?method?of?the?servlet.?br

?*?

?*?This?method?is?called?when?a?form?has?its?tag?value?method?equals?to

?*?post.

?*?

?*?@param?request

?*????????????the?request?send?by?the?client?to?the?server

?*?@param?response

?*????????????the?response?send?by?the?server?to?the?client

?*?@throws?ServletException

?*?????????????if?an?error?occurred

?*?@throws?IOException

?*?????????????if?an?error?occurred

?*/

public?void?doPost(HttpServletRequest?request,?HttpServletResponse?response)

throws?ServletException,?IOException?{

response.setContentType("text/html;charset=utf-8");

PrintWriter?out?=?response.getWriter();

String?method?=?request.getParameter("method");

String?url?=?"";

EBookCZ?bookCZ=new?EBookCZ();

?if?(method?!=?null??method.equals("find"))?{

?System.out.println("find做完了");

??url?=?"EBookMNG.jsp";

??ListEBook?list?=?bookCZ.find();

??request.setAttribute("list",?list);

}?else?if?(method?!=?null??method.equals("findById"))?{

?System.out.println("findbyid做完了");

??url?=?"OK.jsp";

??int?id?=?Integer.parseInt(request.getParameter("id"));

??EBook?book?=?EBookCZ.DelById(id);

??request.setAttribute("book",?book);

}

request.getRequestDispatcher(url).forward(request,?response);

out.flush();

out.close();

}

/**

?*?Initialization?of?the?servlet.?br

?*?

?*?@throws?ServletException

?*?????????????if?an?error?occurs

?*/

public?void?init()?throws?ServletException?{

//?Put?your?code?here

}

}

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