Question

我正在使用jsp和servlets制作网站，我插入了文章编辑器。它适用于textarea并将编辑器中的所有代码放入其中。然后我想在我的servlet中接收此代码并将其插入数据库。收到的代码如下所示：

<p><strong>Inner text</strong></p>
<p>&nbsp;</p>
<p><strong>list item:</strong></p>
<ol>
<li><strong>first item</strong></li>
<li><strong>second item</strong></li>
<li><strong>third one</strong></li>
</ol>
<p>remember to turn off bold text</p>
<h1 style="text-align: center;">H1 title</h1>
<p><em>some common italic text</em></p>
<p><span style="text-decoration: line-through;">strikethrough text =3</span></p>
<p><span style="text-decoration: line-through;">&nbsp;</span></p>

然后从servlet我调用的方法将向db发出插入请求那个方法看起来像这样：

public void insertArticle(String title, String content) {
        Connection con  = null;
        Statement  stmt = null;

        String request = "insert into database_name.articles (title, content) values (" + title + ", " + content + ")";

        try {
            con = DriverManager.getConnection(URL, LOGIN, PASSWORD);
            stmt = con.createStatement();
            stmt.executeUpdate(request);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            if (stmt != null) try {
                stmt.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            if (con != null) try {
                con.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

但我有这样的例外：

        com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' <p><strong>Inner text</strong></p>
        <p>&nbsp;</p>
        <p><strong>list item:</stron' at line 1
            at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
            at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
            at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
            at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
            at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
            at com.mysql.jdbc.Util.getInstance(Util.java:387)
            at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:942)
            at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966)
            at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902)
            at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2526)
            at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673)
            at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2545)
            at com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1540)
            at com.mysql.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2595)
            at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1468)
            at com.lanzdev.classes.DB.insertArticle(DB.java:430)
            at com.lanzdev.servlets.article.Editor.doPost(Editor.java:16)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
            at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
            at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
            at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
            at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
            at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
            at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
            at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
            at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
            at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
            at    
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:879)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:610)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1777)

我试图使用mysql workbench手动插入该html代码并且它可以正常工作，但是从应用程序来看它不是

Answer 1

您应该使用PrepareStatement而不是连接String。

public void insertArticle(String title, String content) {
    Connection con  = null;
    PreparedStatement  stmt = null;

    String request = "insert into database_name.articles (title, content) values (?, ?)";

    try {
        con = DriverManager.getConnection(URL, LOGIN, PASSWORD);
        stmt = con.prepareStatement(request);
        stmt.setString(1, title);
        stmt.setString(2, content);
        stmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        if (stmt != null) try {
            stmt.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (con != null) try {
            con.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

http://docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html

将html代码插入sql

1 个答案: