Spring Boot实现将SQLite本地库的Http离线请求数据发送至服务端

实现将SQLite本地库的HTTP离线请求数据发送至服务端，可以按以下步骤进行：

1. 在Spring Boot项目中引入SQLite依赖

<dependency>
    <groupId>org.xerial</groupId>
    <artifactId>sqlite-jdbc</artifactId>
    <version>3.34.0</version>
</dependency>

2. 创建SQLite数据库并建表

CREATE TABLE http_request (
  id INTEGER PRIMARY KEY AUTOINCREMENT,
  url TEXT,
  method TEXT,
  headers TEXT,
  body TEXT
);

3. 实现数据插入

在需要离线发送HTTP请求的地方，将HTTP请求数据插入到SQLite数据库中。例如，以下示例将一个POST请求插入到SQLite数据库中：

String url = "http://example.com/api";
String body = "{'key': 'value'}";
String method = "POST";
String headers = "{'Content-Type': 'application/json'}";
String sql = "INSERT INTO http_request (url, method, headers, body) VALUES (?, ?, ?, ?)";
jdbcTemplate.update(sql, url, method, headers, body);

4. 实现数据发送

创建一个定时任务，定期从SQLite数据库中查询待发送的HTTP请求数据，并使用RestTemplate发送HTTP请求。例如，以下示例将从SQLite数据库中查询所有待发送的HTTP请求数据，并发送到目标URL：

@Autowired
private JdbcTemplate jdbcTemplate;

@Autowired
private RestTemplate restTemplate;

@Scheduled(fixedDelay = 5000)
public void sendHttpRequests() {
    String sql = "SELECT id, url, method, headers, body FROM http_request";
    List<Map<String, Object>> rows = jdbcTemplate.queryForList(sql);
    for (Map<String, Object> row : rows) {
        String url = (String) row.get("url");
        String method = (String) row.get("method");
        String headers = (String) row.get("headers");
        String body = (String) row.get("body");
        HttpHeaders httpHeaders = new HttpHeaders();
        httpHeaders.setContentType(MediaType.APPLICATION_JSON);
        try {
            Map<String, Object> headerMap = objectMapper.readValue(headers, new TypeReference<Map<String, Object>>() {});
            httpHeaders.setAll(headerMap);
        } catch (IOException e) {
            // handle exception
        }
        HttpEntity<Object> entity = new HttpEntity<>(body, httpHeaders);
        try {
            ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.resolve(method), entity, String.class);
            jdbcTemplate.update("DELETE FROM http_request WHERE id = ?", row.get("id"));
        } catch (Exception e) {
            // handle exception
        }
    }
}

这样，就可以实现将SQLite本地库的HTTP离线请求数据发送至服务端了。