David\'s blog

在阿里云部署springboot项目发现异常。在测试服是正常的，正式服使用了aliyun的redis服务

异常：
Caused by: redis.clients.jedis.exceptions.JedisDataException: ERR unknown command config

应该是阿里云对redis进行了限制

需要增加：
@Configuration
public class RedisConfig {
@Bean
public static ConfigureRedisAction configureRedisAction() {
return ConfigureRedisAction.NO_OP;
}
}

使用场景是想做图片裁剪，直接传oss

基本步骤：
1，图片裁剪，产生base64字符串，略
2，base64转blob
3，blob添加到表单
4，ajax上传

具体：

/**
     * 将以base64的图片url数据转换为Blob
     * @param urlData
     *            用url方式表示的base64图片数据
     */
    function convertBase64UrlToBlob(urlData){
        var bytes=window.atob(urlData.split(',')[1]);        //去掉url的头，并转换为byte
        //处理异常,将ascii码小于0的转换为大于0
        var ab = new ArrayBuffer(bytes.length);
        var ia = new Uint8Array(ab);
        for (var i = 0; i < bytes.length; i++) {
            ia[i] = bytes.charCodeAt(i);
        }
        return new Blob( [ab] , {type : 'image/png'});
    }

3添加到表单：

 var formParam = new FormData();
formParam.append("file",convertBase64UrlToBlob(base64Codes));

4，ajax提交：

$.ajax({
            type: 'POST',
            url: host ,
            data:formParam ,
...

OSS需要额外增加授权：具体参考官方例子
额外传这些参数：

 formParam.append("key",g_object_name);
        formParam.append("policy",policyBase64);
        formParam.append("OSSAccessKeyId",accessid);
        formParam.append("success_action_status",'200');
        formParam.append("signature",signature);

参考 http://www.tuicool.com/articles/QRRJz2J
就是网上50%的转载帖都没写需要自己写个
public DataSource dataSource(){}
方法。不写的结果是 application.properties中的连接池配置数据都没生效！

@Component
@ConfigurationProperties(prefix = "spring.datasource")
public class DruidConfig {
    private String url;

    private String username;

    private String password;

    private String driverClassName;

    private int initialSize;

    private int maxActive;

    private int minIdle;

    private int maxWait;

    private long timeBetweenEvictionRunsMillis;

    private long minEvictableIdleTimeMillis;

    private String validationQuery;

    private boolean testWhileIdle;

    private boolean testOnBorrow;

    private boolean testOnReturn;

    private boolean poolPreparedStatements;

    private int maxPoolPreparedStatementPerConnectionSize;

    private String filters;

    public DruidConfig() {
    }

    public DruidConfig(String url, String username, String password, String driverClassName, int initialSize, int maxActive, int minIdle, int maxWait, long timeBetweenEvictionRunsMillis, long minEvictableIdleTimeMillis, String validationQuery, boolean testWhileIdle, boolean testOnBorrow, boolean testOnReturn, boolean poolPreparedStatements, int maxPoolPreparedStatementPerConnectionSize, String filters) {
        this.url = url;
        this.username = username;
        this.password = password;
        this.driverClassName = driverClassName;
        this.initialSize = initialSize;
        this.maxActive = maxActive;
        this.minIdle = minIdle;
        this.maxWait = maxWait;
        this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
        this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
        this.validationQuery = validationQuery;
        this.testWhileIdle = testWhileIdle;
        this.testOnBorrow = testOnBorrow;
        this.testOnReturn = testOnReturn;
        this.poolPreparedStatements = poolPreparedStatements;
        this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
        this.filters = filters;
    }

    @Bean
    @Primary
    public DataSource dataSource() throws Exception{
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setUrl(this.url);
        druidDataSource.setUsername(this.username);
        druidDataSource.setPassword(this.password);
        druidDataSource.setDriverClassName(this.driverClassName);
        druidDataSource.setInitialSize(this.initialSize);
        druidDataSource.setMaxActive(this.maxActive);
        druidDataSource.setMinIdle(this.minIdle);
        druidDataSource.setMaxWait(this.maxWait);
        druidDataSource.setTimeBetweenEvictionRunsMillis(this.timeBetweenEvictionRunsMillis);
        druidDataSource.setMinEvictableIdleTimeMillis(this.minEvictableIdleTimeMillis);
        druidDataSource.setValidationQuery(this.validationQuery);
        druidDataSource.setTestWhileIdle(this.testWhileIdle);
        druidDataSource.setTestOnBorrow(this.testOnBorrow);
        druidDataSource.setTestOnReturn(this.testOnReturn);
        druidDataSource.setPoolPreparedStatements(this.poolPreparedStatements);
        druidDataSource.setMaxPoolPreparedStatementPerConnectionSize(this.maxPoolPreparedStatementPerConnectionSize);
        druidDataSource.setFilters(this.filters);
        try {
            if(null != druidDataSource) {
                druidDataSource.setFilters("wall,stat");
                druidDataSource.setUseGlobalDataSourceStat(true);
                druidDataSource.init();
            }
        } catch (Exception e) {
            throw new RuntimeException("load datasource error, dbProperties is :", e);
        }

        return druidDataSource;
    }
...set get
}

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
2b:2c:dd:99:a8:1f:a6:e2:b1:59:0d:5d:40:04:df:21.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:4
RSA host key for videoapi3 has changed and you have requested strict checking.
Host key verification failed.

videoapi3代表主机名
简单的解决办法 ：
删除/root/.ssh/known_hosts 中对应的主机记录，重新用ssh连接下就可以了