fix: 加入跨域的配置

server/src/main/java/com/pica/cloud/online/exam/analysis/server/configuration/DataSourceConfig.java

+package com.pica.cloud.online.exam.analysis.server.configuration;
+
+import com.zaxxer.hikari.HikariConfig;
+import com.zaxxer.hikari.HikariDataSource;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.cors.CorsConfiguration;
+import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
+import org.springframework.web.filter.CorsFilter;
+
+import javax.sql.DataSource;
+
+/**
+ * @author wuminghao
+ * @date 2018/8/23 8:46
+ */
+@Configuration
+public class DataSourceConfig {
+    /**
+     * 如果取不到  就用默认值
+     */
+    @Value("${spring.datasource.url}")
+    private String dataSourceUrl;
+
+    @Value("${spring.datasource.username}")
+    private String user;
+
+    @Value("${spring.datasource.password}")
+    private String password;
+
+    @Value("${spring.datasource.hikari.pool-name}")
+    private String poolName;
+
+    @Value("${spring.datasource.hikari.connection-test-query}")
+    private String testQuery;
+
+    @Value("${spring.hikari.cachePrepStmts}")
+    private String cachePrepStmts             ;
+
+    @Value("${spring.hikari.prepStmtCacheSize}")
+    private String prepStmtCacheSize          ;
+
+    @Value("${spring.hikari.prepStmtCacheSqlLimit}")
+    private String prepStmtCacheSqlLimit      ;
+
+    @Value("${spring.hikari.useServerPrepStmts}")
+    private String useServerPrepStmts         ;
+
+    @Value("${spring.hikari.useLocalSessionState}")
+    private String useLocalSessionState       ;
+
+    @Value("${spring.hikari.useLocalTransactionState}")
+    private String useLocalTransactionState   ;
+
+    @Value("${spring.hikari.rewriteBatchedStatements}")
+    private String rewriteBatchedStatements   ;
+
+    @Value("${spring.hikari.cacheResultSetMetadata}")
+    private String cacheResultSetMetadata     ;
+
+    @Value("${spring.hikari.cacheServerConfiguration}")
+    private String cacheServerConfiguration   ;
+
+    @Value("${spring.hikari.elideSetAutoCommits}")
+    private String elideSetAutoCommits        ;
+
+    @Value("${spring.hikari.maintainTimeStats}")
+    private String maintainTimeStats          ;
+    private static final String X_TOTAL_COUNT = "20";
+
+    @Bean
+    public DataSource primaryDataSource() {
+        HikariConfig config = new HikariConfig();
+        config.setJdbcUrl(dataSourceUrl); //数据源
+        config.setUsername(user); //用户名
+        config.setPassword(password); //密码
+        config.setConnectionTestQuery(testQuery);
+        config.setPoolName(poolName);
+        config.addDataSourceProperty("cachePrepStmts", cachePrepStmts); //是否自定义配置，为true时下面两个参数才生效
+        config.addDataSourceProperty("prepStmtCacheSize", prepStmtCacheSize); //连接池大小默认25，官方推荐250-500
+        config.addDataSourceProperty("prepStmtCacheSqlLimit", prepStmtCacheSqlLimit); //单条语句最大长度默认256，官方推荐2048
+        config.addDataSourceProperty("useServerPrepStmts", useServerPrepStmts); //新版本MySQL支持服务器端准备，开启能够得到显著性能提升
+        config.addDataSourceProperty("useLocalSessionState", useLocalSessionState);
+        config.addDataSourceProperty("useLocalTransactionState", useLocalTransactionState);
+        config.addDataSourceProperty("rewriteBatchedStatements", rewriteBatchedStatements);
+        config.addDataSourceProperty("cacheResultSetMetadata", cacheResultSetMetadata);
+        config.addDataSourceProperty("cacheServerConfiguration", cacheServerConfiguration);
+        config.addDataSourceProperty("elideSetAutoCommits", elideSetAutoCommits);
+        config.addDataSourceProperty("maintainTimeStats", maintainTimeStats);
+        HikariDataSource ds = new HikariDataSource(config);
+        return ds;
+    }
+
+    private CorsConfiguration buildConfig() {
+        CorsConfiguration corsConfiguration = new CorsConfiguration();
+        corsConfiguration.addAllowedOrigin("*");
+        corsConfiguration.addAllowedHeader("*");
+        corsConfiguration.addAllowedMethod("*");
+        corsConfiguration.addExposedHeader(X_TOTAL_COUNT);
+        return corsConfiguration;
+    }
+
+    /**
+     * 跨域过滤器
+     *
+     * @return
+     */
+    @Bean
+    public CorsFilter corsFilter() {
+        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
+        source.registerCorsConfiguration("/**", buildConfig()); // 4
+        return new CorsFilter(source);
+    }
+}