在專案中,通過tomcat上部署的web伺服器,客戶端通過http向伺服器的mysql插入資料,但插入的中文會變成???這樣的內容,原因有很多

1.伺服器沒有對request和response進行編碼處理,這點好解決,可以通過設定字符集來處理

/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8"); 
		//這句話的意思，是讓瀏覽器用utf8來解析返回的資料  
        response.setHeader("Content-type", "text/html;charset=UTF-8");  
		service(request, response);

	}
 

@WebFilter("/CharsetFilter")
public class CharsetFilter implements Filter {

    /**
     * Default constructor. 
     */
    public CharsetFilter() {
      
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8"); 
		chain.doFilter(request, response);
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
	
	}

}
 

這個是設定好的值,如果有中文亂碼問題,一些value的值應該是latin或者是其他的編碼表

4.徹底的解決這個問題,本人通過xftp軟體對linux的檔案進行處理,方便.

找到/etc/my.cnf,替換為一下內容

[mysql]
no-auto-rehash
default-character-set=utf8

[mysqld]
port = 3306
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock

# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
default-character-set = utf8
character-set-server = utf8
# Settings user and group are ignored when systemd is used (fedora >= 15).
# If you need to run mysqld under a different user or group,
# customize your systemd unit file for mysqld according to the
# instructions in http://fedoraproject.org/wiki/Systemd
user=mysql

# Semisynchronous Replication
# http://dev.mysql.com/doc/refman/5.5/en/replication-semisync.html
# uncomment next line on MASTER
;plugin-load=rpl_semi_sync_master=semisync_master.so
# uncomment next line on SLAVE
;plugin-load=rpl_semi_sync_slave=semisync_slave.so

# Others options for Semisynchronous Replication
;rpl_semi_sync_master_enabled=1
;rpl_semi_sync_master_timeout=10
;rpl_semi_sync_slave_enabled=1

# http://dev.mysql.com/doc/refman/5.5/en/performance-schema.html
;performance_schema


[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
default-character-set = utf8

[mysql.server]
default-character-set = utf8
[client]
port = 3306
default-character-set = utf8
socket = /var/lib/mysql/mysql.sock
 

service mysql stop 
service mysql start

service mysql restart