这个文件是我反编译过的,没有经过修改,重新编译时为什么总提示: exception;有错误??
package operate_db;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.sql.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
import sun.jdbc.rowset.CachedRowSet;
public class OperateDb
{
protected String query_statement;
protected String param[];
protected Connection conn;
protected String jndiname;
private String conTime;
private boolean isConnected;
public static int conCount = 0;
public OperateDb()
{
query_statement = "";
conn = null;
isConnected = false;
}
protected void setParam(String as[])
{
param = as;
}
private void setQuerystatement(String s)
{
query_statement = s;
}
public Connection getConn()
{
return conn;
}
public void dbConn()
throws Exception
{
if(isConnected)
return;
Object obj = null;
DataSource datasource = null;
if(conCount % 100 == 0)
System.out.println(conCount + "," + Runtime.getRuntime().totalMemory());
try
{
InitialContext initialcontext = new InitialContext();
if(initialcontext == null)
throw new Exception(" Context not Find");
if(datasource == null)
datasource = (DataSource)initialcontext.lookup(jndiname);
if(datasource != null)
{
Connection connection = datasource.getConnection();
if(connection == null)
throw new Exception(jndiname + " connecte fail! ");
isConnected = true;
conn = connection;
conCount++;
initialcontext.close();
}
}
catch(Exception exception)
{
System.out.println(exception.getMessage());
throw new Exception(toString() + " error DataBase " + jndiname + " Connect Fail,Please Wait For 5 Minutes!");
}
}
public void dbClose()
throws Exception
{
if(conn != null && isConnected && !conn.isClosed())
{
isConnected = false;
conn.close();
}
}
protected ResultSet getResult()
{
ResultSet resultset = null;
try
{
PreparedStatement preparedstatement = conn.prepareStatement(query_statement, 1004, 1007);
if(param != null)
{
for(int i = 0; i < param.length; i++)
preparedstatement.setString(i + 1, param[i]);
}
resultset = preparedstatement.executeQuery();
}
catch(Exception exception)
{
System.out.println(exception);
}
return resultset;
}
private int updateRecordDb()
throws SQLException, UnsupportedEncodingException
{
dbConn();
if(!isConnected)
throw new Exception(jndiname + " not connected");
PreparedStatement preparedstatement = conn.prepareStatement(query_statement);
if(param != null)
{
for(int i = 0; i < param.length; i++)
preparedstatement.setString(i + 1, param[i]);
}
preparedstatement.executeUpdate();
preparedstatement.close();
conn.commit();
dbClose();
return 1;
Exception exception;
exception;
System.out.println("updateRecordDb failed:\r\n" + query_statement + " " + exception);
conn.rollback();
return -1;
}
private int updateRecord()
throws SQLException, UnsupportedEncodingException
{
PreparedStatement preparedstatement = conn.prepareStatement(query_statement);
if(param != null)
{
for(int i = 0; i < param.length; i++)
preparedstatement.setString(i + 1, param[i]);
}
preparedstatement.executeUpdate();
preparedstatement.close();
conn.commit();
return 1;
Exception exception;
exception;
System.out.println(exception);
conn.rollback();
return -1;
}
public boolean isHaveField(String s, String s1, String s2)
{
query_statement = "select count(*) as countnum from " + s + " where " + s1 + "='" + s2 + "'";
Object obj = null;
int i;
if(!isConnected)
throw new Exception(jndiname + " not connected");
setQuerystatement(query_statement);
ResultSet resultset = getResult();
resultset.next();
i = resultset.getInt(1);
resultset.close();
if(i > 0)
return true;
return false;
Exception exception;
exception;
System.out.println(exception);
return true;
}
public boolean isHaveField(String s, String s1, long l)
{
query_statement = "select count(*) as countnum from " + s + " where " + s1 + "=" + l;
Object obj = null;
int i;
dbConn();
if(!isConnected)
throw new Exception(jndiname + " not connected");
setQuerystatement(query_statement);
ResultSet resultset = getResult();
resultset.next();
i = resultset.getInt(1);
resultset.close();
dbClose();
if(i > 0)
return true;
return false;
Exception exception;
exception;
System.out.println(exception);
return true;
}
public ResultSet getResult(String s)
{
ResultSet resultset = null;
try
{
if(!isConnected)
dbConn();
if(!isConnected)
throw new Exception(jndiname + " not connected");
setQuerystatement(s);
resultset = getResult();
}
catch(Exception exception)
{
System.out.println("getResult: " + s + ": " + exception);
}
return resultset;
}
public int exeCute(String s)
{
if(!isConnected)
throw new Exception(jndiname + " not connected");
setQuerystatement(s);
return updateRecord();
Exception exception;
exception;
System.out.println("exeCute1: " + s + ": " + exception);
return -1;
}
public int exeSql(String s)
{
setQuerystatement(s);
return updateRecordDb();
Exception exception;
exception;
System.out.println("exeSql: " + s + ": " + exception);
System.out.println(exception);
return -1;
}
public CachedRowSet getRowSet(String s)
{
CachedRowSet cachedrowset = null;
setQuerystatement(s);
try
{
dbConn();
if(!isConnected)
throw new Exception(jndiname + " not connected");
PreparedStatement preparedstatement = conn.prepareStatement(query_statement, 1004, 1008);
if(param != null)
{
for(int i = 0; i < param.length; i++)
preparedstatement.setString(i + 1, param[i]);
}
ResultSet resultset = preparedstatement.executeQuery();
cachedrowset = new CachedRowSet();
cachedrowset.populate(resultset);
preparedstatement.close();
resultset.close();
dbClose();
}
catch(SQLException sqlexception)
{
System.out.println("Error occurs in queryRowSet");
cachedrowset = null;
}
catch(Exception exception)
{
System.out.println(exception.getMessage());
cachedrowset = null;
}
finally
{
return cachedrowset;
}
do
;
while(true);
}
public String computeDouble(String s, String s1, String s2)
{
String s3;
String s4;
s3 = "0";
if(s == null)
s = "";
if("".equals(s))
s = "0";
if(s1 == null)
s1 = "";
if("".equals(s1))
s1 = "0";
s4 = "select " + s + s2 + s1 + " as rtn";
ResultSet resultset = getResult(s4);
if(resultset.next())
{
s3 = resultset.getString("rtn");
if(s3 == null)
s3 = "0";
}
resultset.close();
return s3;
Exception exception;
exception;
System.out.println(exception);
return "0";
}
}
[此贴子已经被作者于2006-8-21 18:46:43编辑过]
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我不方便手工编译，能把详细的错误贴出来么
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谢谢斑竹的关注,我的问题一解决:
在有可能出现异常的语句中加上 try{...}catch(Exception e){} 语句~~
try{
int i = 1/j;//很明显除数不能为0,这句就有可能抛出异常
}
catch(Exception e){}
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呵呵，
你这样解决异常可不大好～
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楼主，
可不可以告诉我怎么反编译.CLASS文件啊?
呵呵
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